“The presence of those words [which I have quoted] does not, in my judgment, modify in any way the obligation imposed by the lease on the tenant to pay a full quarter’s rent on December 25, 1987.”
“16 Before discussing in greater detail the reasoning of the Court of Appeal, the Board will make some general observations about the process of implication. The court has no power to improve upon the instrument which it is called upon to construe, whether it be a contract, a statute or articles of association. It cannot introduce terms to make it fairer or more reasonable. It is concerned only to discover what the instrument means. However, that meaning is not necessarily or always what the authors or parties to the document would have intended. It is the meaning which the instrument would convey to a reasonable person having all the background knowledge which would reasonably be available to the audience to whom the instrument is addressed: see Investors Compensation Scheme Ltd v West Bromwich Building Society[1998] 1 WLR 896 , 912–913. It is this objective meaning which is conventionally called the intention of the parties, or the intention of Parliament, or the intention of whatever person or body was or is deemed to have been the author of the instrument. 17 The question of implication arises when the instrument does not expressly provide for what is to happen when some event occurs. The most usual inference in such a case is that nothing is to happen. If the parties had intended something to happen, the instrument would have said so. Otherwise, the express provisions of the instrument are to continue to operate undisturbed. If the event has caused loss to one or other of the parties, the loss lies where it falls. 18 In some cases, however, the reasonable addressee would understand the instrument to mean something else. He would consider that the only meaning consistent with the other provisions of the instrument, read against the relevant background, is that something is to happen. The event in question is to affect the rights of the parties. The instrument may not have expressly said so, but this is what it must mean. In such a case, it is said that the court implies a term as to what will happen if the event in question occurs. But the implication of the term is not an addition to the instrument. It only spells out what the instrument means.”
“21 It follows that in every case in which it is said that some provision ought to be implied in an instrument, the question for the court is whether such a provision would spell out in express words what the instrument, read against the relevant background, would reasonably be understood to mean. It will be noticed from Lord Pearson's speech that this question can be reformulated in various ways which a court may find helpful in providing an answer—the implied term must “go without saying”, it must be “necessary to give business efficacy to the contract” and so on—but these are not in the Board's opinion to be treated as different or additional tests. There is only one question: is that what the instrument, read as a whole against the relevant background, would reasonably be understood to mean? 22 There are dangers in treating these alternative formulations of the question as if they had a life of their own. Take, for example, the question of whether the implied term is “necessary to give business efficacy” to the contract. That formulation serves to underline two important points. The first, conveyed by the use of the word “business”, is that in considering what the instrument would have meant to a reasonable person who had knowledge of the relevant background, one assumes the notional reader will take into account the practical consequences of deciding that it means one thing or the other. In the case of an instrument such as a commercial contract, he will consider whether a different construction would frustrate the apparent business purpose of the parties. That was the basis upon which Equitable Life Assurance Society v Hyman[2002] 1 AC 408 was decided. The second, conveyed by the use of the word “necessary”, is that it is not enough for a court to consider that the implied term expresses what it would have been reasonable for the parties to agree to. It must be satisfied that it is what the contract actually means. 23 The danger lies, however, in detaching the phrase “necessary to give business efficacy” from the basic process of construction of the instrument. It is frequently the case that a contract may work perfectly well in the sense that both parties can perform their express obligations, but the consequences would contradict what a reasonable person would understand the contract to mean. Lord Steyn made this point in the Equitable Life case, at p 459, when he said that in that case an implication was necessary “to give effect to the reasonable expectations of the parties”. ”
“… in full and final settlement of all claims and satisfaction of all existing and future causes of action that we have against you however so arising out of or in connection with: i) all your obligations and/or liabilities under the Leases and/or the Licences for Alterations; and/or ii) your occupation of the Premises; including VAT (if any), interest and costs, whether or not such claims are known to, have been notified to, or are in the present contemplation of the parties.”