“However, there are two further factors which effectively override considerations as to whether or not there were one, two, three or four contracts between the parties which establish that the Adjudicator was acting within his proper jurisdiction: (a) The substantive decision-making process upon which the Adjudicator had to embark in relation to the disputed claim put before him necessarily involved a consideration of whether there was more than one contract.” (a) The substantive decision-making process upon which the Adjudicator had to embark in relation to the disputed claim put before him necessarily involved a consideration of whether there was more than one contract.”
“It was thus within his jurisdiction to decide in effect that there was one contract, albeit one that may have been varied by agreement. (b) … There may be cases, and this is clearly one, where substance and jurisdiction overlap so that it is within the Adjudicator's jurisdiction to decide as matters within his or her substantive jurisdiction whether there have been in effect variations to the contract pursuant to which he or she has properly been appointed Adjudicator. …” (b) … There may be cases, and this is clearly one, where substance and jurisdiction overlap so that it is within the Adjudicator's jurisdiction to decide as matters within his or her substantive jurisdiction whether there have been in effect variations to the contract pursuant to which he or she has properly been appointed Adjudicator. …”
“That was a case in which there could be no doubt that the adjudicator was properly appointed under the first contract and there could be no argument that, in that capacity, he had jurisdiction to decide whether later "contracts" were simply variations of the first contract or stood on their own entirely separately as contracts in their own right. I am not convinced that this case is authority for any proposition other than that there may be cases in which adjudicators properly appointed have jurisdiction to resolve jurisdictional issues if and to the extent coincidentally those issues are part of the substantive dispute referred to adjudication.”
“One must bear in mind that variations, that is additional, altered, substituted or omitted works, are very common and almost invariably feature in payment disputes between construction contract parties. Many of the adjudication decisions which come to be considered by the TCC involve rulings on whether particular work has been varied and if so what price is to be put on it. Generally, an adjudicator properly appointed under the original contract between the parties to the adjudication will have jurisdiction to determine whether or not particular work was or was to be treated as a variation under or pursuant to that original contract. … That argument will or may in effect give rise both to a substantive defence under the original contract ("there is no entitlement to payment because there is no variation") as well as a jurisdictional challenge ("the adjudicator has no jurisdiction to decide because the extra work can not have been ordered under the original contract which gives the adjudicator jurisdiction in the first place"). This is where there will often be an overlap between jurisdiction and substance.”
“She submitted that the decision in Air Design could readily be distinguished on the basis that in that case, both parties were agreed that there was an initial "Basebuild Contract", which incorporated the terms of the standard form JCT Intermediate Contract, and the central issue was whether three further agreements subsequently entered into between the same parties were separate contracts or variations to the Basebuild Contract. Thus in that case the parties were agreed that the Adjudicator was validly appointed pursuant to the adjudication provisions contained in the Basebuild Contract…” contained in the Basebuild Contract…”
“It appears to me therefore that by reference to the subsequent observations of Akenhead J himself Miss Chambers is right to say that the decision in Air Design is authority only for the proposition that where an adjudicator is properly appointed under a contract about which there is or can be no dispute, then he may also have jurisdiction to resolve jurisdictional issues if they are coincidentally part of the substantive dispute referred to him.”