"The scope of the equitable discretion in a rescission claim is confined to adjustments to achieve substantial restitution to accommodate events that have occurred after the contract has come into force and does not extend to the general reconstruction of the bargain to achieve an objectively fair result." (4) It is well established that the fraudulent behaviour of a party does not entitle the innocent party to be unjustly enriched or to receive some form of windfall without returning what he or she received under the contract from the fraudulent party. Indeed, the object is not to punish the defendant even in the case of fraud. As Lord Wright said in Spence v Crawford[1939] 3 All ER 271 at 288-289: "
"81. Being of the opinion that the decision of Mr Justice McCombe was correct, we propose to deal with the matter relatively briefly. In his judgment, having given a brief summary of the facts, the judge identified (para 5) the two questions to be resolved and (para 6) three basic principles of law accepted by both sides. The first question was the general question whether the court has jurisdiction to award compound interest in respect of a judgment for damages for deceit; the second was, if so, should the court exercise its discretion to do so on the facts of the present case. The basic principles of law are, first, that at common law the courts have no powers to award interest, whether simple or compound, by way of damages on a money claim; second, that under statute (s 35A of the Supreme Court Act 1981 ) the courts have only a power to award simple interest on a debt or damages; third, that courts of equity have a power to award interest in certain specified types of case as part of their general jurisdiction. The judge added that it was agreed that the present case turned on the extent of the court's power under the third principle and, in particular, the extent of the power to award interest, simple and compound, in cases involving "fraud". 82. The leading decision on the power to award compound interest is that of the House of Lords in Westdeutsche Landesbank Girozentrale v Islington LBC[1996] AC 669 . The judge considered that decision with great care and also earlier authorities including Johnson v R[1904] AC 817 (PC) , Wallersteiner v Moir (No.2)[1975] QB 373 (CA) , and President of India v LaPintada Compania Navigacion SA[1985] AC 104 (HL) … 83. In the LaPintada case, Lord Brandon of Oakbrook, at p 116A, having observed that the chancery courts had regularly awarded simple interest as ancillary relief in respect of equitable remedies, continued: "
"Two points of importance are to be observed about the law relating to the award of interest by courts of law [in 1981]. The first point is that neither the Admiralty Court nor Courts of Chancery, have awarded interest, except in respect of monies for which they were giving judgment. The second point is that the Admiralty Court never, and Courts of Chancery only in two special classes of case, awarded compound, as distinct from simple, interest."
"5.1.3 In my opinion the methodology for determining the Conventional Commercial Interest rates in this matter would have been to apply a suitable margin over LIBOR as reward for the risk. The ultra simple model of any lending institution be it a clearing bank or a sub-prime lender is to charge a borrower a rate in excess of the cost of funds to a lender. In this case I would assume that the Defendant would have been required itself to pay a margin over LIBOR for its funds. There are no hard and fast rules but in my experience, for this type of transaction, the cost of funds to a lender would have been in the region of 1-2% over LIBOR. Applying that and adding a margin to bring the rate to the borrower to 3-4% over LIBOR would seem reasonable and in line with the market as I recall . 5.2 (b) Identifying the average margin at the date of the inception of each of the mortgages. 5.2.1 In my opinion the average margin obtainable at the date of the inception of each of the mortgages would have been 4% (and the rate charged to the Borrower would therefore have been in the region of 4% over LIBOR)."
" (1) Benefits derived from land and chattels 17.03 Upon rescission, in addition to returning the assets they received under the contract, each party is usually required to account for the benefits they have gained from ownership of those assets… 17.05 Equally where a party has enjoyed the actual use or occupation of an asset he gained under a contract, upon rescission the court may direct he pay a reasonable user or occupation rent. Such awards have often been made in respect of the occupation of land, but the same principle applies where the use of chattels is concerned. For example, where the purchaser of a motor vehicle rescinds after using the vehicle for a period of time, the court will typically require that he give an allowance for the use he has had."