I was also referred by counsel for Cobrain to the Singapore case of Soh Beng Tee & Co Pte Ltd v Fairmount Development Pte Ltd [2007] SGCA 28 [2007] 3 SLR 86, which I find is of guidance here where in that case, as was in the Tribunal before herein, and which I adopt as part of my reasoning herein, the Arbitrator had not decided on the reasonable time for completion of works after having decided that time was at large, and the Court therein held: “[68] Secondly, given that time is usually set at large when an architect unreasonably fails to extend time under the contract (see Vincent Powell-Smith & David Chappell, A Building Contract Dictionary (Legal Studies & Services (Publishing) Ltd, 2nd Ed, 1990) at p 435), it appears to us that the issues of whether time had been set at large by Fairmount’s acts of prevention and whether time should have been extended under the SIA Conditions because of the acts of prevention by Fairmount are in reality two sides of the same coin. To borrow the terminology adopted by the court in Rotoaira ([55]; supra), they "shade" into each other. The same factual matrix (whether Fairmount caused SBT's delay) is relevant to the determination of both issues.Page 121 Whether the arbitrator should (and could) have decided that time was set at large without fixing the time that SBT was reasonably entitled to is not relevant to whether there has been a breach of the rules of natural justice. If anything, it is pertinent only to whether the Arbitrator had arguably technically committed an error of law - a question well outside the ambit and jurisdiction of this appeal. [69] Thirdly, the concept of time being set at large is not at all alien to construction disputes. It is firmly established that, as mentioned above, time may be set at large due to acts of prevention where there is no contractual provision governing the situation or where the architect fails to properly grant an extension of time under the contract. See also, I N Duncan Wallace QC, Hudson's Building and Engineering Contracts(Sweet and Maxwell, 11th Ed, 1995) vol 2 at para 10.040; Keith Pickavance, Delay and Disruption in Construction Contracts (Lloyd's of London Publishing Ltd, 3rd Ed, 2005) at ch 6. As such, the Arbitrator cannot be accused of using specialist knowledge that the parties could not have contemplated, which would have been contrary to the rules of natural justice: see Zermalt Holdings SA v Nu-Life Upholstery Repairs Ltd [1985] 2 EGLR 14 at 15, wherein Bingham J (as he then was) held that: [T]he rules of natural justice do require, even in an arbitration conducted by an expert, that matters which are likely to form the subject of decision, in so far as they are specific matters, should be exposed for the comments and submissions of the parties.”