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       Eur Ing Professor Geoffrey M. Beresford Hartwell CEng
      
      
       FIMechE  FIET  FCIArb  FICArb(India)  SenMIEEE(USA) 
      Consulting Engineer, Adjudicator, and Chartered Arbitrator 
      
      
       
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Fox and others v P G Wellfair Ltd;  Fisher and another v P G Wellfair Ltd
        
                
                
- Court of Appeal  [1981] Vol. 2 Lloyd's Rep. 514       
     - 6 May 1981
 - (Before Lord DENNING MR, Lord Justice DUNN and Lord Justice O'CONNOR)
 
Arbitration — Duty of arbitrator — Dispute arising out of defective
construction of flats — Appointment of arbitrator who was a member of
the Bar and also a chartered architect and chartered surveyor —
Builders of flats went into liquidation but purchasers had guarantee of
National House-Building Council — Flat-dwellers represented by counsel
and solicitors before arbitrator, but no representation of builders or
council — Arbitrator rejected a large volume of expert evidence and
awarded only a fraction of the amount claimed — Duty of arbitrator when
only one party is represented — Different kinds of arbitrations —
Extent to which an arbitrator is entitled to use his own knowledge and
experience, whether as an aid to the interpretation of expert evidence
or as an independent source of evidence — Arbitrator in the present
case an expert, not a purely legal arbitrator, but the arbitration was
not a commodity arbitration or an informal arbitration — Arbitrator was
entitled in this case to use his special knowledge to understand the
evidence, but not to provide evidence which one party, the builders,
had not chosen to provide for themselves — The arbitrator erred in
failing to put his views, which clearly challenged the basis of the
expert evidence, to the witnesses for comment — An expert arbitrator
can use his general expert knowledge without disclosing it, but if he
forms a view contrary to the evidence which, if not disclosed, would
take the parties by surprise, he should bring it to their attention —
This is particularly so where only one party is present and the
arbitrator is in effect putting the case for the other party — In the
present case the arbitrator gave no indication that he might reject in
large measure the evidence given by qualified expert witnesses — Held
that there had been a failure of natural justice and the arbitrator was
guilty of technical misconduct — Appeal from decision of Ackner J (as
he then was) dismissed — Arbitrator removed, award set aside and
another arbitrator ordered to be appointed 
The
 proceedings reported related to both a main arbitration affecting a number of
 long leaseholders and an individual arbitration in which the claimants were Mr
 and Mrs Fisher. The flats whose defects gave rise to the arbitrations were at
 Dolphin Court, Woodlands, London NW11. The present appeals were from decisions
 by Ackner J. The appellants were nominally the builders of the flats, P G
 Wellfair Ltd, but they were in liquidation and the effective contest was
 between the National House-Building Council (formerly the National
 House-Builders Registration Council), which had guaranteed the builders’ work,
 and the present respondents, the leaseholders. The arbitrator whose award was challenged
 by the leaseholders was Mr Spencer Carlton Rodgers ARICS LRIBA LMTPI,
 barrister.
 
 
Gerald Butler
 QC and Alastair MacGregor (instructed by Stafford Clark & Co) appeared on
 behalf of the appellants; Derek Wood QC and Miss Joanne Moss (instructed by S Rutter
 & Co) represented the respondents.
 
 
Giving
 judgment, LORD DENNING MR said: Dunn LJ, in the course of his valuable
 judgment, has set out the facts in detail. I will only state sufficient to
 illustrate the point of law that arises.
 
 
In 1969 a
 block of flats was built in London. Seven storeys high: 30 flats all told.
 There were many defects in construction. The flat-dwellers claimed damages
 against the builders. The dispute was submitted to arbitration. An arbitrator
 was appointed. He was of acknowledged competence and skill. He conducted the
 proceedings before him with the utmost diligence and the utmost good faith. The
 hearings spread over 10 days. Experts of high repute gave evidence. The
 arbitrator knocked down the amount from £93,000 to only £13,000. The
 flat-dwellers were so aggrieved that they made complaint against the
 arbitrator. The judge upheld their complaint. He has removed the arbitrator for
 misconduct. The judge has set aside his award and has ordered some other person
 to be appointed in his place. It is a serious matter for the parties because of
 all the time and money that have been wasted. It is a serious matter for the
 arbitrator. That goes without saying.
 
 
The most
 extraordinary feature of the whole case is, however, that only the flat-dwellers
 were represented at the hearings before the arbitrator. The builders were
 unrepresented. Yet the flat-dwellers lost and the builders won. The arbitrator
 knocked down the claim by 86%.
 
 
The building
 agreement
 
 
The block of
 flats was called Dolphin Court, Woodlands, London NW11. The developers sold the
 flats to purchasers on long leases for 125 years at prices ranging from £7,000
 to £10,000 a flat. The building agreement was made by each purchaser with the
 builders, P G Wellfair Ltd. They were registered with the National
 House-Builders Registration Council (now known as the National House-Building
 Council). That is the equivalent of an insurance company which guarantees the
 due performance by the builders of their obligations under the agreement. P G
 Wellfair Ltd is now in compulsory liquidation. So the only remedy is against
 the National House-Building Council. They agreed ‘to honour any award made by
 an arbitrator . . . as a consequence of the failure of the builder to make good
 defects in the dwelling notified in writing within two years from the date of
 the certificate and consequent upon non-compliance with the council’s
 requirements if for any reason the builder shall fail to honour such award or
 judgment’.
 
 
The arbitrator
 
 
The
 flat-dwellers complained of many defects within the two years. They formed a
 residents’ association to protect their interests. In 1973 they applied for the
 appointment of an arbitrator. The presidents of the Royal Institutes appointed
 Mr Spencer Carlton Rodgers. He is a chartered architect and a chartered
 surveyor and a member of the Bar.
 
 
Points of
 claim were delivered on March 15 1974. Points of defence on July 12 1974. The
 principal hearings took place before the arbitrator in October and November
 1977. The flat-dwellers were represented by leading counsel. The builders were
 not represented at all. Nor was the National House-Building Council. They
 decided of their own free will to let the proceedings go undefended.
 
 
The
 arbitrator’s point of view
 
 
The arbitrator
 has set down in an affidavit his view of his duty:
 
 
In a case
 where one party is unrepresented, I had always understood that it was the duty
 of the tribunal to see to it that the interests of the unrepresented party were
 protected and that no award was made against that party unless the claim was
 properly proved. I was therefore careful to handle the case, and did to the
 best of my ability handle the case, with this in mind.
 
 
The
 applicants during the main hearing called two witnesses to fact and four
 experts, to all of whose evidence I listened carefully. Where clarification was
 required, I intervened, so that the effect of their evidence was clear to me.
 However, I did not feel that it was part of my duty to indicate at the hearing
 that I did or did not accept any particular evidence. That is in my submission
 a matter for subsequent consideration and decision and for the award.
 
 
On his
 understanding of his duty the arbitrator rejected a large part of the evidence
 of Mr Thomas Akroyd who was a structural engineer of the highest qualifications.
 He had been a vice-president of the Institution of Structural Engineers. The
 arbitrator rejected a large part of the evidence of Mr Ramsay Wilson, a Fellow
 of the Royal Institution of Chartered Surveyors, who made a schedule of defects
 and estimated the cost of remedy. He rejected a large part of the evidence of
 Mr Jonathan Steer who was a chartered quantity surveyor and an examiner for the
 Quantity Surveying Division of the Royal Institution. He rejected a large part
 of the evidence of Mr Eric Shapiro who gave evidence of consequential damage.
 
 
In rejecting
 their evidence, the arbitrator did so without giving any indication to the
 witnesses or to counsel for the flat-dwellers that he was rejecting it. If he
 had given them any indication of his views, they might well have been able to
 correct them. That is the principal point in the case.
 
 
The law
 
 
There are some
 arbitrations in which the arbitrator is expected to form his own opinion and
 act on his own knowledge without recourse to evidence given by witnesses on
 either side: such as an arbitrator who is to decide as to whether goods are up
 to sample; see Mediterranean & Eastern Export Co Ltd v Fortress
 Fabrics (Manchester) Ltd (1948) 64 TLR 337. But there are other
 arbitrations in which the arbitrator is expected to receive the evidence of
 witnesses and the submissions of advocates and to be guided by them in reaching
 his conclusion: such as arbitrations on shipping contracts or on building
 contracts. In such cases the arbitrator is often selected because of his
 knowledge of the trade — so that he can follow the evidence and the
 submissions. But he must act judicially. He must not receive evidence in the
 absence of the other party, and so forth. In the present case if the defendants
 had been represented I have no doubt that the plaintiffs’ experts would have
 been cross-examined so as to throw doubt on their findings and on their
 opinions: and the defendants would have called experts to support the line of
 cross-examination. The arbitrator would then have been able to form a judgment
 — based on evidence other than his own.
 
 
I cannot think
 it right that the defendants should be in a better position by failing to turn
 up. Nor is it right that the arbitrator should do for the defendants what they
 could and should have done for themselves. His function is not to supply
 evidence for the defendants but to adjudicate upon the evidence given before
 him. He can and should use his special knowledge so as to understand the
 evidence that is given — the letters that have passed — the usage of the trade
 — the dealings in the market — and to appreciate the worth of all that he sees
 upon a view. But he cannot use his special knowledge — or at any rate he should
 not use it — so as to provide evidence on behalf of the defendants which they
 have not chosen to provide for themselves. For then he would be discarding the
 role of an impartial arbitrator and assuming the role of advocate for the
 defaulting side. At any rate he should not use his own knowledge to derogate
 from the evidence of the plaintiffs’ experts — without putting his own
 knowledge to them and giving them a chance of answering it and showing that his
 own view is wrong. Such is the way in which we dealt in the pensions cases when
 a medical expert was himself a member of the tribunal: see Moxon v Minister
 of Pensions [1945] KB 490 and Starr v Minister of Pensions
 [1946] KB 345 at pp 353-4.
 
 
I am afraid
 that the arbitrator fell into error here. He felt that it was his duty to
 protect the interests of the unrepresented party — in much the same way as a
 judge protects a litigant in person. But in a case like this I do not think it
 is the duty of the arbitrator to protect the interests of the unrepresented
 party. If the defendants do not choose to turn up to protect themselves, it is
 no part of the arbitrator’s duty to do it for them. In particular he must not
 throw his own evidence into the scale on behalf of the unrepresented party — or
 use his own special knowledge for the benefit of the unrepresented party — at
 any rate he must not do so without giving the plaintiffs’ experts a chance of
 dealing with it — for they may be able to persuade him that his own view is
 erroneous.
 
 
The arbitrator
 in an affidavit uses an illuminating sentence. He says:
 
 
I formed the
 view that the claim was grossly exaggerated and, if I may say so, I thought a
 large part of it was a ‘try on’.
 
 
If that were a
 correct view of the claim, it was for the defendants to come before the
 arbitrator and show it to be so. By not coming to the arbitration they
 virtually admitted that it was a genuine claim which was not exaggerated but
 only needed assessment. They ought not to leave it to the arbitrator to pull
 the irons out of the fire for them: or to take up cudgels on their behalf. For
 thereby they expose him to the charge of being partial to their side and not impartial
 as he ought to be.
 
 
To my mind
 therefore the National House-Building Council are, in a sense, the authors of
 all the trouble. By not turning up, they placed the arbitrator in an awkward
 position. They left him without any assistance. This led to his making a
 mistake. If they had been represented, I am sure he would have made no mistake
 at all. In the circumstances I do not think it fair to say that the arbitrator
 himself has been guilty of misconduct. What has happened is that the
 proceedings have been misconducted: and the arbitrator has to take
 responsibility for it. He has ‘misconducted the proceedings’ within section 23
 of the Arbitration Act 1950. The award must be set aside. The arbitrator must
 be removed and a new arbitrator appointed. I agree with the judge and would
 dismiss the appeal.
 
Agreeing DUNN
 LJ said: The claimants in the main arbitration, as it has been called, are 28
 purchasers of long leases of flats built by the respondents at Dolphin Court,
 NW, in the 1960s. Each purchaser entered into an identical form of
 house-purchaser’s agreement with the builders, supplemental to the contracts
 for the purchase of their leases, between the purchaser and the selling company
 Lizco Ltd, an associated company of the respondents. The house-purchaser’s
 agreement in effect gave the purchasers a contractual remedy against the
 builders guaranteed by the National House-Builders Registration Council (now
 the National House-Building Council, which I will call NHBC), so that remedy
 was effective in the event that the builders became insolvent. We were told
 that in general building societies will not lend money for the purchase of
 newly built houses unless the purchaser enters into such an agreement, so that
 almost all purchases of new houses up and down the country are covered by
 agreements in this form, and their terms are of general importance.
 
 
By the
 agreement the builder on behalf of NHBC undertakes that the council will
 perform certain undertakings set out in a schedule. These are to honour any
 award made by an arbitrator or any judgment of a court as a consequence of the
 failure of the builder to make good defects in the dwelling (which includes by
 definition the common parts) notified in writing within two years of a
 certificate issued by NHBC, and consequent upon non-compliance with the
 requirements of NHBC if for any reason the builder fails to honour such award
 or judgment. The requirements of NHBC are set out in a technical handbook
 rather like local authority building regulations and issued from time to time.
 The undertakings are expressed to be subject to certain exclusion clauses not
 relevant to this case, and to an overall limit of liability.
 
By the
 agreement itself the builder warrants that the dwelling has been built in an
 efficient and workmanlike manner, and so as to comply with NHBC requirements.
 The purchaser is obliged to report in writing any defects in the building
 consequent upon any breach by the builder of NHBC requirements as soon as
 possible after they appear. The agreement further provides that no claim shall
 be13
 entertained in respect of the common parts unless it is made by the purchaser
 jointly with all other purchasers, although a claim by a defined corporation
 shall be deemed to be made by the purchaser jointly with all other purchasers.
 In this case there was such a corporation, effectively a tenants’ association
 called Dolphin Court (Woodlands) Ltd of which all purchasers were shareholders.
 
 
The
 house-purchaser’s agreement contained an arbitration clause, clause 12, in the
 following terms:
 
 
If any
 dispute shall arise between the purchaser and the builder concerning any matter
 or thing arising hereunder or in connection herewith such dispute shall be and
 is hereby referred to the arbitration and final decision of an arbitrator to be
 appointed at the request of either party by the Presidents of the Royal
 Institute of British Architects and of the Royal Institution of Chartered
 Surveyors from a panel of arbitrators nominated by them and such reference
 shall be deemed to be a reference to arbitration within the meaning of the
 Arbitration Act 1950 . . .
 
 
By a second
 schedule to the agreement certain terms and conditions were to be observed by
 the purchaser. By clause 2(a) it was provided:
 
 
The purchaser
 shall notify the council in writing as soon as practicable after its appearance
 of any damage which the council is liable to make good or defray the cost of
 making good under paragraph (2) of clause (B) of the First Schedule hereto. (b)
 Before his claim is investigated the purchaser shall pay to the council an
 investigation fee which will be based on current professional charges. The
 council will then arrange for an investigation under the supervision of a
 chartered member of the Royal Institute of British Architects or the Royal
 Institution of Chartered Surveyors or a member of any other appropriate
 professional institution who will if the claim is found valid in principle
 prepare a schedule of the work necessary to make good the damage . . . (d) In
 any other case where the purchaser does not agree with the findings of the
 council but nevertheless wishes to pursue his claim the matter shall be
 referred to an arbitrator appointed by the Presidents for the time being of the
 Royal Institute of British Architects and of the Royal Institution of Chartered
 Surveyors from a panel nominated by them. Any claim shall be deemed to be made
 on the basis of the above conditions.
 
 
In this case
 cracks appeared in the building both before and after completion. The machinery
 under the second schedule to the agreement, which I have just read, was put
 into operation and on March 14 1973 Mr Fisher on behalf of Dolphin Court
 (Woodlands) Ltd applied for the appointment of an arbitrator. The application
 was made on the standard form which recites certain defects in the building
 which have appeared and been reported
 
 
by me to the
 builder . . . Now therefore I hereby apply to the NHBRC to request the
 President of the Royal Institute of British Architects and/or of the Royal
 Institution of Chartered Surveyors to appoint an arbitrator from a panel
 nominated by them who shall be completely independent of the NHBRC. He will
 conduct proceedings as provided by the Arbitration Act 1950 . . . Terms of
 reference. To consider and determine whether the defects set forth in the
 Schedule hereto are consequent upon non-compliance by the builder with the
 standards currently approved by the NHBRC and to make an appropriate award. As
 a condition of the appointment I hereby agree as follows: (1) That the
 arbitrator’s award will be in complete satisfaction of my claim. (2) That I
 have read ‘Disputes about Defects’ published by the NHBRC and understand that
 the arbitrator may in his discretion initially require a deposit . . .
 
 
The booklet
 ‘Disputes about Defects’ contains the following relevant provisions under
 ‘Arbitration’, paragraph 20:
 
 
- 20. This is
 carried out separately from the NHBRC. Arbitration is a legal procedure
 governed by the Arbitration Act 1950 . . . How is the arbitrator chosen?  
 - 21. The arbitrator is appointed from a panel
 nominated by the Royal Institute of British Architects and the Royal
 Institution of Chartered Surveyors. He works quite independently of the NHBRC
 and, once arbitration proceedings have started, any correspondence must be with
 the arbitrator not with the NHBRC. . . . Is the arbitrator then an architect or
 chartered surveyor?  
 - 22. Yes. He will be
 an architect or surveyor who has been nominated by his Royal Institute or
 Institution, and he will have substantial experience of housing work and be
 familiar with the provisions of the Arbitration Act. Does the arbitrator visit
 the house and take evidence from both sides? 
 
 - 23. The arbitrator is free to decide what he will do in any particular
 case, but he would normally visit the house. He will take evidence from both
 sides, possibly requiring evidence to be given on oath as in a court of law. He
 will make up his mind on the evidence and it is not necessary for either party
 in a dispute to employ solicitors or other professional advisers though they
 may do so. This may be advisable if the dispute is complex or defects are
 major.
 
 
  
 
We were told
 that a panel of arbitrators is appointed by the presidents of the RIBA and RICS
 for NHBC arbitrations. The panel covers the whole country and an arbitrator for
 the area concerned is nominated by the presidents for a particular reference.
 In this case Mr Rodgers, a member of the panel, was nominated. After confirming
 that he was on the panel, the purchasers accepted the nomination. On September
 3 1973 the arbitrator held his first appointment and gave directions. The
 arbitration was concerned with the common parts of the dwelling. On April 29
 1974 points of claim in the main arbitration were delivered. The claim was
 framed in summary in this way:
 
 
In
 consequence of the respondents’ said breaches of contract the claimants have
 suffered loss and damage and will incur expense in having remedial work carried
 out to the said dwellings and the block, and have suffered damage in that the
 value and/or their beneficial enjoyment of their flats is substantially
 diminished thereby.
 
 
An unpriced
 schedule of defects prepared by a surveyor was delivered with the points of
 claim. It contained 148 items, many of them small, which were subsequently
 remedied by the builders and seen by the arbitrator on May 14 1975. Some 80
 defects remained unremedied. On July 12 1974, points of defence were delivered
 consisting of in effect a denial. There was also a request for further and
 better particulars of the points of claim. On May 24 1976 a compulsory
 winding-up order was made in respect of the building company. In July 1976 the
 liquidator indicated that the builders did not wish to appear or be represented
 in the arbitration. On October 27 1976 the Companies Court gave the purchasers
 leave to continue the arbitration, and also another action against the
 architect. Between 1974 and 1976 the arbitrator visited the premises on four
 occasions, including Mr Fisher’s flat at his request. Meanwhile, five other
 arbitrations had been instituted by individual purchasers, including the Fishers,
 relating to defects in their own flats. 
These arbitrations had been referred to
 the same arbitrator, Mr Rodgers. On April 14 1977, further and better
 particulars of the points of claim in the main arbitration were delivered.
 These particularised the claim in this way: the claim for remedial work was
 quantified in the figure of £57,242.69 plus VAT. Then it was said:
 
 
In addition,
 after completion of the said works there will be a continuing (but markedly
 reduced) tendency to movement within the brickwork. The defect will continue to
 impose upon Dolphin Court (Woodlands) Ltd the necessity of carrying out
 recurring maintenance work of an exceptional character throughout the term of
 the claimants’ leases, to the cost of which the claimants will continue to have
 to contribute. The claimants estimate that such works of maintenance will be
 required every five years and that they will cost (at current prices)
 approximately £6,000 at each occasion.
 
 
3. The
 claimants further say that, as a result of the irrevocable nature of the defect
 described . . . the capital value of their flats has been permanently
 diminished by about 7 1/2 per centum.
 
 
4. The
 claimants also claim (a) general damages for the inconvenience and loss of
 amenity which they will suffer during the period of the necessary remedial
 works . . . and (b) the amount of the extra insurance premiums they will have
 to pay in respect of the protection and security of their property during the
 said period.
 
 
In May and
 June 1977 there were interlocutory meetings, at one of which the chief
 conciliation officer of the NHBC was present. NHBC were given leave to attend
 the hearing and leave to apply to take part in it. On October 24 1977 the
 hearing began. No representative of NHBC was present. The purchasers were represented
 by counsel and solicitors. Therefore the claim was undefended. But the
 arbitrator rightly made it clear that the purchasers must prove their claim
 strictly. This involved not only proof of the defects, the cost of remedying
 them and the consequential damage, but also of proving that the defects fell
 within the technical requirements of NHBC, and that the purchasers had complied
 with the various provisions as to notice and time contained in the
 house-purchaser’s agreement. Moreover, as no documents were admitted in the
 defence, it was necessary for the purchasers to prove all contractual and other
 documents strictly. Accordingly the purchasers called six witnesses, two
 witnesses of fact including Mr Fisher and four experts, Mr Akroyd, a consulting
 engineer, Mr Wilson, a chartered surveyor who prepared the original schedule of
 defects, Mr Steer, a quantity surveyor who costed the schedule, and Mr Shapiro,
 a chartered surveyor and valuer who dealt with the14
 consequential damage. Each witness produced reports, schedules and costings
 covering his particular discipline. Not surprisingly the hearing took seven
 working days, and Mr Fisher made a contemporary note of the proceedings which
 appears in our bundle.
 
 
After the
 hearing the arbitrator had another view of the premises. One of the issues was
 whether under NHBC requirements the builders were obliged to construct the roof
 so that it was of sufficient strength to take roof gardens. It was admitted
 that the roofs were not of sufficient strength, and there was a good deal of
 evidence on the assumption that if they were required to be of sufficient
 strength to take the roof gardens then what would be the cost of strengthening
 the roofs?
 
 
In April 1978
 there was a further hearing in the arbitrator’s chambers. On May 24 the
 purchasers delivered written submissions on the roof strengthening issue. On
 May 24 and 25 the hearing of the individual arbitrations took place, and on May
 25 there was a further hearing in the main arbitration. On August 3 the
 purchasers’ counsel submitted proposed alternative forms of award on the basis
 either that the arbitrator accepted or rejected the roof strengthening as a
 necessary requirement. In the autumn of 1978 the purchasers’ solicitors were
 pressing for an award. On December 7 1978 the arbitrator published his first
 interim award. It ran to 12 pages, and I will read some of the material parts
 of it:
 
 
27. That in
 constructing the block of flats the respondents failed to comply with a number
 of the technical requirements of the NHBC whereby the structure of the block of
 flats (and of certain of the flats therein) was and is defective.
28. That the
 defects include defects in the ‘common parts’ of the building within the
 meaning of the NHBC house-purchasers’ agreements.
29. That
 although before the compulsory winding-up order the respondents remedied some
 of the defects in the ‘common parts’ there were and still are substantial
 defects that have not been remedied and as to which it will be appropriate for
 me to make further awards or interim awards.
-
31. That the
 extent of the necessary remedial work will depend on whether the claimants or
 any of them are entitled to the reconstruction or strengthening of the roof of
 the eastern end of the building.
-
33. That in
 any event some of the claimants will suffer a greater loss of enjoyment of
 their individual flats or of the common parts than others, and that the extent
 of such loss may depend upon whether or not the remedial work includes the
 reconstruction or strengthening of the herebefore referred to roof.
34(1)  That the fact that the respondents did not
 provide a roof or roofs capable of use as one or more roof gardens by the
 lessees or occupants of flats nos 28 and 30 was not a breach by the respondents
 of the technical requirements of the NHBC and (2) that in assessing the
 damages, if any, to be paid by the respondents to the claimants, or any of
 them, in respect of defects in the common parts of Dolphin Court, the claimants
 are not entitled to the inclusion of an amount to cover the cost of
 reconstructing or strengthening of roofs to enable such roofs or part of them
 to support roof gardens.
On January 2
 1979 the purchasers’ solicitors wrote saying that they did not intend to apply
 to the High Court, so there was no request for a special case to be stated in
 respect of the award relating to the roof strengthening, and no complaint has
 been made about that in these proceedings.
 
 
On April 12
 1979 the arbitrator published what he called his third interim award, the
 material parts of which are as follows:
 
 
3. For the
 purposes of this third interim award I repeat all the findings of fact
 contained in the above-mentioned interim award 
- that is the
 interim award which I have just read.
4. By
 paragraph 29 of the interim award I found that notwithstanding that the
 respondent remedied some of the defects in the ‘common parts’ there remained
 substantial defects that had not been remedied and as to which it will be
 appropriate for me to make further awards or interim awards.
Then he made
 his award, paragraph (3) of which fixed it in the total sum of £13,167. Then
 paragraph (4):
 
 
As I have no
 jurisdiction to make an award against the respondent in favour of parties other
 than the claimants it is appropriate that I deduct and I do deduct 4/76 (four
 seventy-sixth’s) from the above assessment and I apportion the balance of such
 total damages, as money to be paid to the claimants in the same proportions as
 the claimants as lessees of their respective flats have covenanted to pay
 maintenance charges to the Association, Dolphin Court (Woodlands) Ltd.
 
 
Accordingly he
 awarded a total of £12,471 including an amount in respect of interest to the
 claimants to be made within 30 days of the award.
 
 
On the same
 day the arbitrator published his award in the individual arbitrations. He
 awarded Mr and Mrs Fisher £1,213 as against a claim of £3,800. He also made
 awards in the other four individual arbitrations, but there is no complaint
 about any of those. On May 24 1979 the purchasers, including Mr Fisher, served
 notices of motion in the main arbitration and in Mr Fisher’s arbitration
 applying that the arbitrator be removed on the ground of misconduct;
 alternatively that the awards be set aside on the same ground. The grounds of
 the application so far as material were, firstly, that the arbitrator ‘failed
 to determine the questions in dispute in accordance with the unchallenged
 evidence tendered at the hearing of the reference'; secondly, that he ‘took
 into account facts and matters which tended to contradict or might have
 contradicted the said unchallenged evidence without giving the claimants notice
 or opportunity of dealing with the same'; and, thirdly, that he ‘failed to
 conduct the said proceedings in accordance with the principles of natural
 justice’. It is the second and third grounds which were relied upon before the
 learned judge and in this court.
 
 
On December 4
 1979 Ackner J (as he then was) allowed the applications and ordered that the
 arbitrator be removed on the ground of misconduct and the awards be set aside.
 The ratio of his decision appears at p 28 of his judgment starting at letter C,
 and was in these terms:
 
 
In my
 judgment the officious bystander, who had had the resilience to listen
 attentively at all stages of these arbitrations, who had heard the very careful
 and detailed manner in which every aspect of the claims had been supported both
 by argument and by evidence, would have been justifiably provoked, on reading
 the awards, into saying to the applicants, ‘Well, you’ve been badly treated by
 the arbitrator.’  Translated into
 forensic language, the arbitrator failed to provide the applicants with a fair
 hearing, in that he failed to give them any opportunity to deal with the very
 serious deficiencies which he must ultimately have found in the present action
 and/or proof of their claim. There must have been major matters of criticism to
 have resulted in the dismissal of so large a part of the claim. An arbitrator
 is not, in my judgment, entitled in such circumstances to hide behind his
 hitherto immunity from giving a reasoned decision and thus enable it to be
 claimed that since it cannot be established that the deficiency he found was
 one of fact or law or both the aggrieved party has no remedy. There was, in my
 judgment, such a mishandling of these arbitrations as was likely to amount to a
 substantial miscarriage of justice. The proceedings were not conducted in
 accordance with the principles of natural justice, the applicants being in
 effect condemned unheard to lose the greater part of their claims.
 
 
Before Ackner
 J and before this court the respondents were represented by leading counsel,
 who were effectively instructed by NHBC.
 
 
In the course
 of his judgment the learned judge dealt with the expertise of the arbitrator at
 p 25, where he said this:
 
 
The
 arbitrator, while stating that he himself was an architect and chartered
 surveyor, explained that these were essentially paper qualifications and that
 since 1946 he had been a practising member of the Bar. He was thus sitting as a
 legal arbitrator and not as a lay expert.
 
 
This comment
 was based on one sentence in a note of the proceedings taken by Mr Fisher,
 which is in the following terms:
 
 
(Arbitrator)
 Acquired his knowledge since 1946. He is an architect and chartered surveyor on
 paper, but since 1946 as counsel.
 
 
In the context
 in which that remark was made, it seems to me to have been no more than a
 pleasantry by the arbitrator. Although the arbitrator had sworn an affidavit
 before the application was heard by Ackner J, the parties agreed that it should
 not be put before the judge. In this court both parties agreed that we should
 see it and also a second affidavit sworn after the judgment.
 
 
It appears
 from the affidavits and also an affidavit from Mr Johnstone, who is employed by
 the RIBA, that Mr Rodgers holds the qualifications LRIBA and ARICS. He was
 senior assistant valuer to the Gloucestershire County Council from 1942 to
 1944. He was called to the Bar in 1946, since when he has been in practice
 specialising in building disputes. In 1969 he was placed on the NHBC Panel on the
 recommendation of the presidents of the RIBA and the15
 RICS. Since 1970 he has been appointed arbitrator in more than 200 building
 disputes. He is one of the NHBC arbitrators for London. It is quite clear from
 that evidence, which was not before the judge, that the arbitrator was an
 expert as that word is understood, and not simply a legal arbitrator. The
 reference to the arbitration incorporating the pamphlet ‘Disputes about
 Defects’ made it clear to the parties that the arbitrator would be an expert. In
 my view the judge fell into error in not regarding him as an expert. In any
 event it would be unusual to remove an arbitrator for misconduct without giving
 him an opportunity to be heard.
 
 
But the fact
 that the arbitrator was an expert does not conclude this appeal. The question
 remains, especially in the unusual circumstances of this case where there was
 no opposition to the claim, how far an arbitrator’s expertise extends and how
 far an arbitrator is entitled to use the expertise he has to arrive at different
 conclusions from those of the expert witnesses, without putting his views to
 them so that they may have the opportunity of dealing with them.
 
 
Mr Butler for
 NHBC relied on the following four propositions of law:
 
 
(1)  It is not misconduct for an arbitrator to
 come to an erroneous decision whether of fact or law, even if that decision is
 unsupported by evidence.
 
 
(2)  It is not misconduct for an arbitrator to
 award a sum which is either excessive or inadequate.
 
 
(3)  It is not misconduct for an arbitrator to
 refuse to accept unchallenged evidence.
 
 
(4)  Where an arbitrator is appointed partly for
 his own expertise he can in coming to his award use that expertise.
 
 
Mr Wood for
 the purchasers accepts those propositions as far as they go, but says that they
 do not go far enough to cover the facts of this case. He submitted that by the
 manner in which the arbitration was conducted the arbitrator kept the
 purchasers in the dark as to his doubts, and misled them. He submitted that the
 general principles of natural justice were applicable to arbitrations, whether
 defended or undefended, and whether the arbitrator was an expert or not. He
 submitted that all parties were entitled to know the case that they had to meet
 and to comment upon it. He submitted that it was the duty of an expert
 arbitrator to hear both sides, and if he was proposing to take any facts into
 account which did not appear from the evidence it was his duty to put them to
 the witnesses. He submitted that in this case the arbitrator in awarding a much
 lower figure than that suggested by the experts for the purchasers should have
 put the basis upon which that figure was arrived at to the expert witnesses so
 that they might have an opportunity of dealing with it. He submitted that in
 failing to do that the arbitrator was in breach of the principles of natural
 justice, and that amounted to misconduct.
 
 
The bona fides
 of the arbitrator are not in question. He disputed that as an arbitrator he was
 under the duty suggested by Mr Wood and found by the judge. He set out his
 position as he saw it in his affidavit of June 9 1980 sworn after the judgment.
 He said:
 
 
11. . . . I
 did not feel that it was part of my duty to indicate at the hearing that I did
 or did not accept any particular evidence. That is in my submission a matter
 for subsequent consideration and decision and for the award. As appears below,
 I did in fact reject some of the evidence of opinion tendered to me.
 
 
12. Nor did I
 feel that there was a duty on me, or indeed that it was the practice of the
 court or of an arbitration tribunal, to tell the applicants, or to reconvene
 the hearing to tell the applicants, that they had not proved the whole or part
 of their case and give them a further opportunity to do so. I took the view on
 the basis of the adversary or accusatorial system which prevails in England
 that it was for the party to prove his claim, and not for me to proceed on the
 continental or inquisitorial system to make enquiries and to call or recall
 evidence (apart, as I have said, on matters of clarification). Had the
 applicants been unrepresented I might have taken the latter course, but these
 applicants had prepared their case fully and were represented by counsel and
 solicitors, and, as I have said, they called two witnesses to fact and four
 experts. The main hearing lasted more than five days and every aspect was fully
 canvassed. Certainly the applicants were not ‘condemned unheard’.
 
 
The question
 in this appeal is whether the arbitrator was right in the view that he formed
 as to the law, or whether the judge was right.
 
 
This question
 seems to me at the end of the day to turn on the application of the principles
 of natural justice. It was a very unusual situation. In the first place this
 was not a commodity arbitration where the arbitrator is usually concerned to
 decide whether the quality of goods is in accordance with the contract, or
 whether the bulk corresponds to the sample. In such a case the arbitrator is
 chosen by the parties for his expertise in relation to those particular goods.
 Nor was this an informal arbitration. On the contrary, the proceedings were
 extremely formal; they were conducted as if in a court of law, and evidence was
 given on oath. The arbitrator insisted on everything being strictly proved, and
 therefore he himself was bound to observe the formalities of legal proceedings.
 Finally, the claim was undefended at the hearing. That did not mean that the
 arbitrator was obliged to accept the claim without question. Nor did it mean
 that he was under an obligation to protect the party who was not present. His
 function was to hold the scales as evenly as he could and to act fairly and
 judicially in the conduct of the hearing. I accept that in the circumstances it
 was a difficult role for the arbitrator. What should he have done and how
 should he have approached the problem?
 
 
In the first
 place it is a matter for the arbitrator whether he accepts or rejects the
 evidence, and his award cannot be set aside on the ground of misconduct because
 there is no evidence to support it. The proper remedy in such a case is to
 require a case to be stated on the point of law as to whether there was
 evidence or not (see Oleificio Zucchi SPA v Northern Sales Ltd
 [1965] 2 Lloyd’s Rep 496). And where the onus lies on the claimant to prove his
 case or part of it, eg to prove a contract or trade custom, the arbitrator is
 not bound to accept even uncontroverted evidence, and may find that the
 evidence given still falls short of establishing the case to be proved. In Lewis
 Emanuel & Son Ltd v Sammut [1959] 2 Lloyd’s Rep 629 Pearson J
 (as he then was) at p 634 said this:
 
 
. . . in my
 view, it is a quite untenable suggestion to say that there is any evidence of
 misconduct on the part of the umpire in coming to the conclusion to which he
 did come. That is the first ground, and, putting it very shortly, my main basis
 of decision that a court, or tribunal of fact, is not bound to accept evidence,
 and may find that evidence given, even if the evidence is accepted in the sense
 that it is true evidence, may still obviously fall short of establishing the
 allegation in support of which it is intended to be called.
 
 
But this does
 not help solve the problem where the arbitrator has to choose between rival
 views of experts, especially when one of the experts is himself.
 
 
It is well
 established that where an arbitrator hears evidence in the absence of either or
 both parties, his award will be set aside on the ground of misconduct, unless
 perhaps it can be shown that the evidence would not have affected the award
 (see Walker v Frobisher (1801) 6 Ves 70; Re Brook, Delcomyn
 and Badart (1864) 16 CBNS 403 where it was held that the principle applied
 to mercantile as well as legal arbitration; Re O’Conor and Whitlaw’s
 Arbitration (1919) 18 LJKB 1242; Royal Commission on Sugar Supply v Trading
 Society Kwik-Hoo-Tong (1922) 38 TLR 684; and Eastcheap Dried Fruit Co
 v Gebroeders Catz [1962] 1 Lloyd’s Rep 283). On the analogy of those
 cases, it seems to me that an expert arbitrator should not in effect give evidence
 to himself without disclosing the evidence on which he relies to the parties,
 or if only one, to that party. He should not act on his private opinion without
 disclosing it. It is undoubtedly true that an expert arbitrator can use his own
 expert knowledge. But a distinction is made in the cases between general expert
 knowledge and knowledge of special facts relevant to the particular case. In Mediterranean
 and Eastern Export Co Ltd v Fortress Fabrics (Manchester) Ltd [1948]
 2 All ER 186, Lord Goddard CJ at p 187 said:
 
 
The more
 serious question that was argued was that neither side had tendered evidence
 with regard to damage and, therefore, the arbitrator had no material before him
 on which he could fix the amount which the sellers were entitled to receive.
 This would be a formidable, and, indeed, fatal objection in some arbitrations.
 If, for instance, a lawyer was called on to act as arbitrator on a commercial
 contract he would not be entitled, unless the terms of the submission clearly
 gave him power so to do, to come to a conclusion as to the amount of damages
 that should be paid without having evidence before him as to the rise or fall
 of the market, as the case may be, or as to other facts enabling him to apply
 the correct measure of damage, but, in my opinion, the case is different where
 the parties select an arbitrator, or agree to arbitrate16
 under the rules of a chamber of commerce under which the arbitrator is
 appointed for them, and the arbitrator is chosen or appointed because of his
 knowledge and experience of the trade. There can be no doubt that with regard
 to questions of quality and matters of that description an arbitrator of this
 character can always act on his own knowledge.
 
 
 
Then the Lord
 Chief Justice cited various authorities including Jordesan & Co v Stora,
 etc Aktiebolag (1931) 414 L Rep 201, the judgment of Branson J, who said:
 
 
Now, I think
 that the fact that this umpire was an expert in the timber trade and was
 appointed because he was such an expert must not be lost sight of. I think the
 parties must be taken to have assented to his using the knowledge which they
 chose him for possessing; I do not mean to say knowledge of special facts
 relating to a special or particular case, but that general knowledge of the
 timber trade which a man in his position would be bound to acquire.
 
 
So if the
 arbitrator is relying on general expert knowledge, there is no need to disclose
 it. O’Connor LJ gave a good example in argument. An arbitrator is required to
 value a bull killed by the negligence of one of the parties. If the expert
 arbitrator relies on his general knowledge of the value of bulls, including
 fluctuations in the market known to anyone who studies the market, there is no
 need to disclose it. But if he has recently sold an identical bull for a
 certain sum, it is necessary to disclose that to the parties. Or if the dead
 bull is found by the arbitrator, unknown to the parties, to be suffering from
 some disease or injury which reduces its value, it is necessary to disclose
 that fact to the parties. So in assessing rents, an expert arbitrator can rely
 on his general knowledge of comparable rents in the district. But if he knows
 of a particular comparable case, then he should disclose details of it before
 relying on it for his award.
 
 
]
This view,
 which is based on the general principles of natural justice, is supported by
 authority. Societe Franco Tunisienne D’Armement-Tunis v Government of
 Ceylon [1959] 1 WLR 787 was a case in which there were two advocate
 arbitrators and an umpire. It was held that the umpire had misconducted himself
 in a technical sense ‘since his view of the law as applied to the facts before
 him involved a radical departure from the cases as presented by the parties,
 and raised complicated issues of law on which further evidence might be
 required; and as on the evidence before the court it did not appear either that
 that change was made sufficiently clear to the owners, or that they were given
 a sufficient opportunity to reframe their case in the light of an unexpected
 development, the proceedings were unsatisfactory and contrary to natural
 justice’. Pilcher J sitting in the Court of Appeal, who had wide experience of
 commercial and admiralty arbitration, at p 805 said:
 
 
I think that
 this — the view of the umpire — was such a radical change in the position that
 it is one that (the umpire) should have made perfectly clear to both
 arbitrators.
 
 
Then at the
 bottom of p 805 the learned judge said:
 
 
I think the
 probabilities are overwhelming in favour of the view that (the umpire), while
 he no doubt had these things in mind, never brought them clearly, if he brought
 them at all, to the attention of the two arbitrators. That being so, I cannot
 help feeling that the trial of this matter was unsatisfactory, because Mr Ellis
 — one of the arbitrators — might have presented an interesting and important
 argument to the umpire and might have invited the umpire to state his award in
 the form of a special case. But he never had that opportunity, on the view
 which I take of the facts. Consequently, I think that the hearing before the
 umpire was of so unsatisfactory a nature that this court is justified in saying
 that the case must be remitted to the umpire to consider further the whole
 question as to the amount of demurrage, if any, which was due to the owners at
 Colombo.
 
 
That principle
 seems to me to apply to questions of fact as much as to a question of law. If
 the expert arbitrator, as he may be entitled to do, forms a view of the facts
 different from that given in the evidence which might produce a contrary result
 to that which emerges from the evidence, then he should bring that view to the
 attention of the parties. This is especially so where there is only one party
 and the arbitrator is in effect putting the alternative case for the party not
 present at the arbitration.
 
Similarly, if
 an arbitrator as a result of a view of the premises reaches a conclusion
 contrary to or inconsistent with the evidence given at the hearing, then before
 incorporating that conclusion in his award he should bring it to the attention
 of the parties so that they may have an opportunity of dealing with it. In R
 v Paddington and St Marylebone Rent Tribunal, ex p Bell London &
 Provincial Properties Ltd [1949] 1 KB 666, Lord Goddard CJ at p 682 said
 this:
 
 
It is no part
 of the duty of this court to review a finding of fact by the tribunal, though
 it is certainly remarkable that it should be found that flats of this
 description, erected, as we were informed, very shortly before the late war,
 and the plans of which must have been passed and approved by the London County
 Council, do not conform to present-day standards, when it is notorious that the
 building of this class of flats has not been allowed since the war. But not a
 word was said by anybody during the hearing, or at any time before the decision
 was given, as to this being a ground for reduction of rent. It has, in fact,
 taken the advisers of the applicants entirely by surprise, and surely in common
 fairness, if this was to be considered by the tribunal they ought to have given
 the applicants some opportunity of dealing with it. That this could ever have
 been in the minds of the borough council in referring these matters is, of
 course, impossible to suppose, and as we have already said, not a single word
 was said by the representative of the borough council as to any of the grounds
 on which the tribunal was invited to act.
 
In our
 opinion, to take into account a matter of this kind, of which no sort of
 intimation had been given to the applicants, brings this case exactly within
 the decision of the House of Lords in Board of Education v Rice
 [1911] AC 179, the judgments in which are so well known that we need not set
 them out. On that ground alone, we think that the eight determinations in this
 case, even if the reference were unobjectionable, would have to be quashed.
 
 
That was in
 the context that before the tribunal entered on the hearing there was an
 inspection of the flats by the members. In giving their decision, the tribunal
 said:
 
 
In fixing the
 rents of the various flats, it is not out of place to point out that these
 flats are not up to modern standards. In no single flat is the ceiling more
 than eight feet from the floor. This is less than is required by present-day
 standards.
 
Lord Goddard
 continued:
 
 
It appears from
 the affidavit of the chairman of the tribunal that during the course of the
 inspection they had some conversation with a Mr Marshall, described as the
 manager of Park West — the block of flats concerned — and another member of the
 staff and one or other of them, it is not clear which, agreed that the height
 of the ceiling which was measured, was less than that required by present-day
 standards.
 
 
So much for
 the principles. How do they apply to the facts of this case?  Apart from the question of the roof strengthening,
 the central issue in the main arbitration was the cause of the cracks in the
 building. Mr Akroyd, a structural engineer, gave two reports and also gave
 evidence. He found that the cracks were caused by differential thermal movement
 between the concrete frame of the building and the brick infills, concrete
 having a different coefficient of expansion from brick under temperature and
 that movement joints should have been incorporated in the structure. Mr Akroyd
 said that this was irremediable although the movement could be reduced by
 certain works which he described as very expensive. At the conclusion of his
 report under the heading ‘Remedial Measure’, he said:
 
 
It is
 virtually impossible at this juncture to introduce any movement joints into the
 structure; these should have been built into the structure initially. The
 cracking of the building due to thermal movement cannot be eliminated. The only
 scope for improvement lies in reducing the range of temperature experienced by
 the structural members.
 
 
Most benefit
 would be obtained by providing additional insulation to the roof structure, but
 this is a costly exercise. It would be necessary to remove the existing
 asphalt, lay insulation material and then lay a new asphalt finish. On the
 basis of similar work carried out elsewhere recently, in the Home Counties, we
 would anticipate that the cost could be of the order of £10,000.
 
 
Because of
 the load-carrying characteristics of the roof the existing asphalt must be
 removed before the new asphalt and insulation can be laid. This will add to the
 expense of remedial measures since precautions will be necessary to protect the
 building during the work otherwise the top-floor flats would be open to
 penetration of water when the asphalt is removed. This extra expense could
 increase the cost of the work by a further £2,000.
 
 
That report was made on November 3 1975. Mr Akroyd was a very
well qualified structural engineer. He was vice-president of the
Institution of Structural Engineers and he had a wide experience in
structural engineering. His view of the effect of the thermal movement
was the basis of the costings of the quantity surveyor for the remedial
works, a total figure of £63,659 including £25,066, the cost of the
insulation of the roofs at the date of the arbitration. It was also the
basis of Mr Shapiro’s assessment of damages as to the necessity for a
maintenance fund to deal with further movement which he put at £29,444
and also the loss of enjoyment likely to be suffered by the purchasers
while the extensive work was being carried out, and the depreciation in
the capital value of their flats, which was described as a ‘stigma’.
 
 
In his
 affidavit the arbitrator broke down his total award. He awarded £1,250 for work
 on the underside of the ring beams, £5,500 for the insulation to the roofs, and
 £3,250 for the sealing of the ring beams. Those were the principal items,
 together with an item of £1,007 for contingencies, VAT and interest. Under
 ‘Roof Insulation’ he had the note ‘Allowed above £5,500.’  Under ‘Quinquennial Maintenance’ he had the
 note: ‘Both items disallowed. With the defects which had already been remedied
 by respondents and with the allowances made for defects above, the maintenance
 would be no more than would be required in any ordinary building.’  Then: 
‘Stigma — Having regard to my findings
 above, having regard to the fact that the flats had been occupied happily by
 the applicants for eight or nine years and having regard to the minor nature of
 the claims which had been substantiated, I found that there was no question of
 any ‘stigma’ or reduction in value of the building by reason of the alleged
 defects.’  Then: ‘Loss of Enjoyment —
 Having regard to the minor nature of the claim allowed, I formed the view that
 there was no justification for this item.’ 
 Then in paragraph 15:
As I have
 said before, I considered a claim of nearly £200,000 to be grossly excessive in
 respect of a building whose cost had been about £280,000 in 1969-71 and which
 had been occupied by the purchasers ever since . . . . It was a building in
 which a substantial amount of remedial work had been carried out and the
 remainder of which was allowed for in my awards. Such work should last for
 between 10 and 20 years and much of it may not ever need to be carried out
 again. Moreover, the insulation should limit very much any thermal movement.
 
 
 
 
The only
 explanation the arbitrator gave for awarding a total of something over £13,000
 as against the claim put forward by the experts appears in the affidavit in one
 sentence in paragraph 14 where he says: ‘. . . I formed the view that the claim
 was grossly exaggerated and, if I may say so, I thought a large part of it was
 a ‘try on’.’
 
 
An analysis of
 the arbitrator’s affidavit shows that in accepting that work was required to
 insulate the roofs he must have accepted Mr Akroyd’s evidence that there was
 differential thermal movement and that that was the cause of the cracks. So
 this was not a case where the arbitrator was rejecting the expert’s evidence in
 toto. On the other hand, he must have rejected Mr Akroyd’s evidence as to the
 irremedial nature of the defects and have formed the view that they could be
 remedied very much more easily and cheaply than Mr Akroyd or any other of the
 expert witnesses had said. It is not sufficient in my view for the arbitrator
 to say simply that the claim was grossly exaggerated. He may be right. The
 original claim for the roof insulation in March 1976 was £10,162. But that is
 nearly double the figure which he awarded. In order to reach that view, he must
 have made a comparison between the figures put forward by the experts and his
 own figures based on some scheme which he had in mind for the necessary
 remedial works. In those circumstances, natural justice required that he should
 have put his alternative scheme and alternative costings to the experts to give
 them an opportunity of dealing with them. The issues in the arbitration were
 not simply questions of general expert knowledge. They involved the separate
 disciplines of a structural engineer, a quantity surveyor, a chartered
 surveyor, and a valuer. The arbitrator’s expertise did not on the face of it
 cover all of those disciplines. I am, however, content to assume that he had
 sufficient expertise to enable him in effect to challenge the evidence of the
 experts, but his views should have been clearly put to them. In failing to take
 that course, in my view the arbitrator was guilty of technical or legal
 misconduct in failing to observe the principles of natural justice.
 
But in this
 case the arbitrator went further than simply keeping silent as to his own
 opinion of the claim. During the hearing he made no criticism of the expert
 evidence except in relation to the roof strengthening, and the validity of the
 claim for damages for loss of amenity and inconvenience. During the course of
 the hearing he said that he would decide the case on the evidence, and at its
 conclusion he said that he would consider the evidence in depth and might
 recall some of the witnesses, but he did not do so although he asked for and
 was given written submissions on the question of roof strengthening. He stated
 that it would be contrary to the purchasers’ interests for him to break down
 his award. He suggested that he might treat the maintenance fund as part of the
 depreciation in value of the building due to the thermal movement, thereby
 implying that he was minded to award a sum for the latter but not the former as
 well.
 
 
All this
 supports Mr Wood’s submission that the arbitrator lulled the purchasers into
 falsely believing that he had broadly accepted the main contentions of their
 experts and, although he might reduce some of the heads of claim, he did not
 have it in mind to award a figure which must have been based on his own private
 opinion of the feasibility of some entirely different scheme of remedial works.
 In other words, not only did he keep his private opinion to himself, but he
 also positively suggested that he had no alternative view to put to the
 experts.
 
 
The same
 considerations apply to a lesser extent to Mr Fisher’s arbitration. In any
 event, in view of the misconduct in relation to the main arbitration, I do not
 think that the award in Mr Fisher’s arbitration can stand either. Mr Fisher
 must have lost confidence in the arbitrator by reason of his conduct of the
 main arbitration.
 
 
In those
 circumstances, I agree with the judge that the award must be set aside, that
 the arbitrator must be removed, and that another arbitrator be appointed to
 hear the reference in accordance with the terms of the arbitration clause in
 the house-purchaser’s agreement. 
For those reasons I would dismiss this appeal.
 
 
Agreeing that
 the appeal should be dismissed, O’CONNOR LJ, whose judgment was read in his
 absence by the Master of the Rolls, said: In 1969 a property development
 company Lizco Ltd engaged Wellfair Ltd to build a block of 30 flats called
 Dolphin Court in North London. When the flats were built long leases were sold
 off to purchasers and the common parts of the building vested in a company in
 which the leaseholders were the shareholders to manage the block. The
 purchasers of the leases each entered into what is known as a house-purchaser’s
 agreement. This is an agreement which gives each purchaser contractual rights
 against the builder and the National House-Building Council guarantees the
 liability of the builder under the agreement. The agreement has an arbitration
 clause submitting disputes arising thereunder to the arbitration of an
 arbitrator to be appointed by the presidents of the RIBA and RICS from a panel
 of arbitrators nominated by them.
 
 
In the present
 case disputes did arise and the leaseholders contended that the building was
 defective. The major dispute was between the leaseholders jointly and Wellfair
 Ltd in respect of the common parts of the building. Some leaseholders including
 Mr Fisher were in dispute with Wellfair Ltd in respect of their own flats. The
 leaseholders invoked the arbitration clause and in May 1973 Mr Spencer Rodgers
 was duly appointed arbitrator. During the next two or three years it seems that
 the parties tried to reach some agreement. Wellfair Ltd carried out a lot of
 remedial work putting right a large number of minor defects. In February 1976 a
 compulsory winding-up order was made to wind-up Wellfair Ltd. In due course the
 leaseholders obtained the leave of the court to proceed with the arbitration.
 The official receiver decided to take no part in the arbitrations. That left
 the NHBC as guarantors. They decided to take no part in the arbitrations,
 merely to pay whatever award was made.
 
 
The arbitrator
 told the leaseholders that they would have to prove their claims strictly. They
 prepared their evidence with that end in view. The hearing began on October 24
 1977 and lasted seven days. Counsel were called in April 1978 and again in May.
 No award came forth until December 1978 when an interim award on one issue was
 published. The main issues in the joint arbitration were decided in an award
 published in April 1979. The arbitrator awarded the leaseholders £12,471
 including some interest against a claim for some £93,000. Mr Fisher got an
 award for £1,213 against a claim for £3,817.
 
 
It looked to
 the leaseholders and Mr Fisher that something had gone very wrong. They
 formulated two main complaints, that the arbitrator:
 
 
(i)  Took into account facts and matters which
 contradicted the unchallenged evidence without giving the leaseholders notice
 or opportunity of dealing with the same.
 
 
(ii)  Failed to conduct the proceedings in
 accordance with the principles of natural justice.
 
 
On these
 grounds the leaseholders moved the court to set aside the awards and remove the
 arbitrator for misconduct. At this stage the proceedings became defended — it
 is obvious that the NHBC supported the defence of the awards. The judge would
 have none of it; he held that there had been a grave breach of the rules of
 natural justice, set aside the award and removed the arbitrator.
 
 
Now an appeal
 is made against that decision. In my judgment the learned judge came to a
 correct decision. It is well settled law that it is misconduct in an arbitrator
 if he hears evidence in the absence of a party or the parties. In effect that
 is what has happened in this case. A major complaint of the leaseholders
 depended on the evidence of Mr Akroyd, a structural engineer with very high
 qualifications. He said that the cracks which appeared all over the building
 were caused by the fact that the co-efficient of expansion for concrete was
 different from that for brick and that due to defective design or construction
 the concrete frame had not been jointed to the brickwork to allow for this
 difference. He said that the trouble could not be cured but could be
 ameliorated by doing expensive work of insulation especially to the roof. This
 trouble gave rise to three heads of claim: (i) The cost of insulation and
 repairs of the existing cracks. (ii) A sinking fund to meet the cost of
 repairing future cracking. (iii) Compensation for the diminution in the value
 of the building. These matters were spoken to in detail by Mr Akroyd supported
 by a quantity surveyor and two chartered surveyors, all distinguished
 professional men. The insulation alone was £10,000, and all three claims came
 out at well over £30,000.
 
 
In an
 affidavit which was not before the judge but has been put before us the
 arbitrator has broken down his award. He says he allowed £5,500 for the
 insulation and rejected both heads (ii) and (iii). The effects of this must be
 that the arbitrator has decided that some unidentified work can be done for
 £5,500 which will permanently cure the defect. He can only have come to this
 conclusion by in effect giving evidence to himself in flat contradiction to the
 evidence of the leaseholders’ professional witnesses, in particular Mr Akroyd.
 Those witnesses were given no chance to consider and comment upon the
 arbitrator’s theory, whatever it was. He may be right, but the issue has not
 been tested fairly.
 
 
This is not a
 case of a trade arbitrator deciding whether the bulk complies with the sample.
 In the present case, because of something said in the notes of evidence, the
 judge thought that this arbitrator only had paper qualifications and was
 therefore a legal arbitrator. I think that not having had the arbitrator’s
 thesis, whatever it was, put to the unchallenged highly qualified witnesses is
 a grave miscarriage of the rules of natural justice. It is also quite contrary
 to the settled law that arbitrators must not take evidence in secret.
 
 
Nothing that I
 say in this case must impugn the right of arbitrators to use their own
 knowledge in appropriate cases; that is essential to arbitration in very many
 cases. It will be right in most cases where the NHBC arbitration clause is
 involved that the arbitrator from the skilled panel will use without fear his
 own ability. That is the ordinary building contract dispute. That freedom of
 decision which arbitration submissions have always given to arbitrators does
 not go to support the award in this case.
 
 
I would
 dismiss the appeal.
 
 
The appeal
 was dismissed with costs. Leave to appeal to the House of Lords was refused.