“14.There is no dispute that the principles on which a contract (or any other instrument or utterance) should be interpreted are those summarised by the House of Lords in Investors Compensation Scheme Ltd v West Bromwich Building Society[1998] 1 WLR 896 , 912-913. They are well known and need not be repeated. It is agreed that the question is what a reasonable person having all the background knowledge which would have been available to the parties would have understood them to be using the language in the contract to mean. The House emphasised that “we do not easily accept that people have made linguistic mistakes, particularly in formal documents” (similar statements will be found in Bank of Credit and Commerce International SA v Ali[2002] 1 AC 251 , 269, Kirin-Amgen Inc v Hoechst Marion Roussel Ltd[2005] RPC 169 , 186 and Jumbo King Ltd v Faithful Properties Ltd(1999) 2 HKCFAR 279 , 296) but said that in some cases the context and background drove a court to the conclusion that “something must have gone wrong with the language". In such a case, the law did not require a court to attribute to the parties an intention which a reasonable person would not have understood them to have had. Para 11: 15. It clearly requires a strong case to persuade the court that something must have gone wrong with the language and the judge and the majority of the Court of Appeal did not think that such a case had been made out. On the other hand, Lawrence Collins LJ thought it had. It is, I am afraid, not unusual that an interpretation which does not strike one person as sufficiently irrational to justify a conclusion that there has been a linguistic mistake will seem commercially absurd to another: compare the Kirin-Amgen case[2005] RPC 169 at pp. 189-190. Such a division of opinion occurred in the Investors Compensation Scheme case itself. The subtleties of language are such that no judicial guidelines or statements of principle can prevent it from sometimes happening. It is fortunately rare because most draftsmen of formal documents think about what they are saying and use language with care. But this appears to be an exceptional case in which the drafting was careless and no one noticed. 22. In East v Pantiles (Plant Hire) Ltd(1981) 263 EG 61 Brightman LJ stated the conditions for what he called “correction of mistakes by construction": “Two conditions must be satisfied: first, there must be a clear mistake on the face of the instrument; secondly, it must be clear what correction ought to be made in order to cure the mistake. If those conditions are satisfied, then the correction is made as a matter of construction.” 23. Subject to two qualifications, both of which are explained by Carnwath LJ in his admirable judgment in KPMG LLP v Network Rail Infrastructure Ltd[2007] Bus LR 1336, I would accept this statement, which is in my opinion no more than an expression of the common sense view that we do not readily accept that people have made mistakes in formal documents. The first qualification is that “correction of mistakes by construction” is not a separate branch of the law, a summary version of an action for rectification. As Carnwath LJ said (at p. 1351, para 50): “Both in the judgment, and in the arguments before us, there was a tendency to deal separately with correction of mistakes and construing the paragraph ‘as it stands’, as though they were distinct exercises. In my view, they are simply aspects of the single task of interpreting the agreement in its context, in order to get as close as possible to the meaning which the parties intended.” 24. The second qualification concerns the words “on the face of the instrument". I agree with Carnwath LJ (at pp 1350-1351) that in deciding whether there is a clear mistake, the court is not confined to reading the document without regard to its background or context. As the exercise is part of the single task of interpretation, the background and context must always be taken into consideration. 25. What is clear from these cases is that there is not, so to speak, a limit to the amount of red ink or verbal rearrangement or correction which the court is allowed. All that is required is that it should be clear that something has gone wrong with the language and that it should be clear what a reasonable person would have understood the parties to have meant. In my opinion, both of these requirements are satisfied.” “Two conditions must be satisfied: first, there must be a clear mistake on the face of the instrument; secondly, it must be clear what correction ought to be made in order to cure the mistake. If those conditions are satisfied, then the correction is made as a matter of construction.” “Both in the judgment, and in the arguments before us, there was a tendency to deal separately with correction of mistakes and construing the paragraph ‘as it stands’, as though they were distinct exercises. In my view, they are simply aspects of the single task of interpreting the agreement in its context, in order to get as close as possible to the meaning which the parties intended.”
“Whether this clause is a condition precedent or a contractual term of some other character must depend on (i) the form of the clause itself, (ii) the relation of the clause to the contract as a whole, (iii) general considerations of law.”
“If upon written application to him by the Contractor the Architect…is of the opinion that the Contractor has been involved in direct loss and/or expense for which he would not be reimbursed by a payment made under any other provision in this Contract by reason of the regular progress of the Works or of any part thereof having been materially affected by [various listed factors such as late information] and if the written application is made within a reasonable time of it becoming reasonably apparent to him that the progress of the Works or any part thereof has been affected as aforesaid, then the Architect should either himself ascertain or instruct the Quantity Surveyor to ascertain the amount of such loss and/or expense…”
“ The common features of Clauses 24(1) and 11(6) are first that both are “if” provisions, that is , provisions which only operate in the event that the contractor invokes them by making a written application, secondly, that if an application is made the architect must form an opinion whether the contractor has suffered direct loss and/or expense in the circumstances of the kind there set out, thirdly, that the written application must be made within a reasonable time after a stated event, and, fourthly, that the architect must then ascertain the amount of the loss or expense which is then added to the contract sum.”