“35A.— Power of High Court to award interest on debts and damages. (1) Subject to rules of court, in proceedings (whenever instituted) before the High Court for the recovery of a debt or damages there may be included in any sum for which judgment is given simple interest, at such rate as the court thinks fit or as rules of court may provide, on all or any part of the debt or damages in respect of which judgment is given, or payment is made before judgment, for all or any part of the period between the date when the cause of action arose and— (a) in the case of any sum paid before judgment, the date of the payment; and (b) in the case of the sum for which judgment is given, the date of the judgment … (3) Subject to rules of court, where— (a) there are proceedings (whenever instituted) before the High Court for the recovery of a debt; and (b) the defendant pays the whole debt to the plaintiff (otherwise than in pursuance of a judgment in the proceedings), the defendant shall be liable to pay the plaintiff simple interest at such rate as the court thinks fit or as rules of court may provide on all or any part of the debt for all or any part of the period between the date when the cause of action arose and the date of the payment. (4) Interest in respect of a debt shall not be awarded under this section for a period during which, for whatever reason, interest on the debt already runs.”
“However, a contractual claim for interest must be pleaded. Where a contract provides for the payment of interest, the agreed terms will normally displace the court's discretionary power to award interest undersection 35A of the Senior Courts Act 1981 . This is because the court respects what the parties have agreed as to interest rather than substituting its own discretion. This is recognised in part by s.35A(4), which provides that, “Interest in respect of a debt shall not be awarded under this section for a period during which, for whatever reason, interest on the debt already runs”
“The Defendant also claims, in the alternative, that in breach of clause 11.1 of the ECSURS the RR Entities acquired Applicable Engine Control System Units for use in the PAS at a much lower cost than that to which they were entitled. The Defendant alleges that, had the RR Entities complied with clause 11.1 of the ECSURS, the RR Entities would have acquired the same number of Applicable Engine Control System Units but would have paid World List Price and/or IPC x Mark Up for all or some of them and claims the difference in price as damages. This is denied by the RR Entities.”
“This issue can be dealt with briefly. Goodrich’s case is that the RR Entities should pay damages reflecting the difference between the amount paid for the Units used in the PAS (i.e. IPC) and the amount which should have been paid, which will depend on the Court’s findings in relation to what the correct price was.”
“(1) Where a claimant has delayed unreasonably in commencing or prosecuting proceedings, the court may exercise its discretion either to disallow interest for a period or to reduce the rate of interest. (2) In exercising that discretion, the court must take a realistic view of delay. In the case of business disputes, litigation is for all parties an unwelcome distraction from their proper business. It is not reasonable to expect any party to take every litigious step at the first possible moment, or to concentrate on litigation to the exclusion of all else. Delay should only be characterised as unreasonable for present purposes when, after making due allowance for the circumstances, it can be seen that the claimant has neglected or declined to pursue his claim for a significant period. (3) When determining what disallowance or reduction of interest should be made to mark a period of unreasonable delay, the court should bear in mind that the defendant has had the use of the money during that period of delay.”
“If interest is withheld the defendant receives a windfall. He has free use of funds which, if he had performed his obligation to pay, would not have been in his hands, since the English Courts have no jurisdiction to order compound interest, the defendant will enjoy the further benefit of relatively inexpensive use of funds, even if finally ordered to pay interest for the entire period from the cause of action arising until Judgment. Whereas, in a case such as Birkett v Hayes … where the claim cannot be quantified for a long period after the cause of action has arisen, and the proceedings commenced, it is not difficult to see unfairness to the defendant in requiring interest to be paid on the whole of the sum not then quantifiable, it is much harder to detect any unfairness to a defendant left with substantial funds in his hands, and knowing perfectly well the amount of the claim during the whole of the material time, from the initial presentation of the claim. If there is no material previous to the defendant by reason of the delay, it is difficult to see why the interests of justice should normally require that when he knows that amount claimed, he should have an even larger benefit bestowed on him than he would derive from his unjustifiably refusing to pay the claim. Having regard however to the way in which Lord Justice Lawton (with whose judgment Lord Justice Eveleigh agreed, as did implicitly Lord Denning M.R.) expressed the principle, it would appear that justification for depriving the successful plaintiff of interest must be that he has caused his loss of use of the money by his own fault rather than that it would be unfair or unjust to the defendant that he should have to pay interest during the delay. This countervailing consideration would be consistent with the compensatory function of the interest jurisdiction. In cases where the delay and the degree of fault are so substantial that the predominant cause of the plaintiff being out of his money can be seen to be his own failure to prosecute the claim, rather than the defendant's maintenance of his defence, it is not difficult to see the policy should be that a successful plaintiff should not be compensated for loss of use of the money. However, in order for it to be said that the plaintiff's fault has displaced the defendant's fault as the predominant cause of the plaintiff being kept out of his money, the delay in question would have to be very substantial and not merely relatively short periods of weeks or months, during which, in commercial litigation, lulls in activity inevitably occur and the plaintiff's fault would have to be very substantial as where an action has inexcusably been allowed to go to sleep for years.”