“… The fundamental principle is that interest is not awarded as a punishment, but simply because the plaintiff has been deprived of the use of the money which was due to him.”
“… [Interest] is awarded because it is only just that the person who has been deprived of the use of the money due to him should be paid interest on that money for the period during which he was deprived of its enjoyment.… [The defendants] enjoyed the use of the money during the whole of this time and in law it is deemed to have been due to them from the beginning of that period.” [Lord Salmon] Then he cited from the speech of Lord Wilberforce: “Where a wrongdoer has failed to pay money which he should have paid, justice, in principle, requires that he should pay interest over the period for which he has withheld the money.”
“It is for this reason that interest will generally run from the date of accrual of the cause of action in respect of money then due or loss which then accrues; and in respect of loss which accrues at a date between accrual of the cause of action and judgment, from such date.… But the power to award interest is discretionary, and there is certainly no rule that interest will invariably run from the date of loss. It is no part of my task to attempt to define the circumstances in which the court will depart from the fundamental principle; indeed, since the discretion to award interest is unfettered, it would be improper to do so. There appear, however, to be three main groups of cases in which, in the exercise of its discretion, the court may depart from the fundamental principle. The first group of cases concerns the position of the defendant. The court may consider, in the light of all the circumstances, that his position was such that it would not be just to make the defendant pay interest from the date of loss. It may do so if, for example, the circumstances were such that the defendant neither knew, nor reasonably could have been expected to know, that the plaintiff was likely to make a claim, and so was in no position either to tender payment, or even to make provision for payment if the money should be found due. In such a case, the court may in its discretion only grant interest from the date of the plaintiff’s claim, or even from such a date as will allow reasonable investigation of the claim. Again, to quote from Lord Wilberforce’s speech in the Firestone case, at page 836: ‘In a commercial setting, it would be proper to take account of the manner in which and the time at which persons acting honestly and reasonably would pay.’ On that principle, the majority of the House took account of a normal commercial practice under which royalties in respect of use before grant of a patent are not expected to be paid until grant, and so awarded interest only from the date of the grant. There are no doubt other examples. The second group of cases concerns the conduct of the plaintiff. If, for example, the plaintiff has been guilty of unreasonable delay in prosecuting his claim, the court may decline to award interest for the full period from the date of loss. This may be to encourage plaintiffs to prosecute their claims with diligence, and also because such conduct may lull a defendant into a false sense of security, leaving him to think that the claim will not be pursued against him.…” “The basic principle is, however, that interest will be awarded from the date of loss. Furthermore, the mere fact that it is impossible for the defendants to quantify the sum due until judgment has been given will not generally preclude such an award.… There must have been many cases in the commercial court in which, although the quantum of damages was in doubt until the date of judgment, interest was awarded from the date of loss.”
“Despite the way in which Lord Herschell LC in London, Chatham and Dover Railway Co v South Eastern Railway Co[1983] AC 429 , 437 stated the principle governing the award of interest on damages I do not think the modern law is that interest is awarded against the defendant as a punitive measure for having kept the plaintiff out of his money: I think the principal now recognised is that it is all part of the attempt to achieve restitutio in integrum. One looks, therefore, not at the profit which the defendant wrongfully made out of the money he withheld – this would involve a scrutiny of the defendant’s financial position – but at the cost to the plaintiff of being deprived of the money which he should have had. I feel satisfied that in commercial cases the interest is intended to reflect the rate at which the plaintiff would have had to borrow money to supply the place of that which was withheld. I am also satisfied that one should not look at any special position in which the plaintiff may have been; one should disregard, for instance, the fact that a particular plaintiff, because of his personal situation, could only borrow money at a very high rate or, on the other hand, was able to borrow at specially favourable rates. The correct thing to do is to take the rate at which plaintiffs in general could borrow money. This does not, however, to my mind mean that you exclude entirely all attributes of the plaintiff other than that he is a plaintiff. There is evidence here that large public companies of the size and prestige of these plaintiffs could expect to borrow at 1 per cent over the minimum lending rate, while for smaller and less prestigious concerns the rate might be as high as 3 per cent. over the minimum lending rate. I think it would always be right to look at the rate at which plaintiffs with the general attributes of the actual plaintiff in the case (though not, of course, with any special or peculiar attribute) could borrow money as a guide to the appropriate interest rate. If commercial rates are appropriate I would take 1 per cent over the minimum lending rate as the proper figure for interest in this case.”
“In my judgment the authorities to which I have referred establish the following principles and factors as material to the exercise of the discretion. (1) In principle interest is to be awarded to compensate the claimant for being kept out of the money from the date when it has been established that it was due to him; it is not based on fault or the wrongful withholding of payment by the defendant. (2) The starting date will therefore normally be the date to which the 1981 Act refers, namely the date the cause of action arose and so, in indemnity insurance (subject to any express terms of the cover) the date of loss. (3) It follows from (1) that generally the existence of and need to investigate a genuine dispute as to liability is not a material factor in postponing the running of interest. The position is not so clear where there is a dispute or uncertainty as to the quantum of the claim. It can be said that money is not due until it is at least claimed to be due in a specific amount and, as Mr Hapgood submitted, quantification of a claim is, unlike liability issues, likely to be a matter only within the knowledge of the insured. It can equally be said, however, that there is no real difference in principle from a dispute as to liability: once the answer is known it establishes not only that payment was due but also what was due and when it became due. In my judgment the latter is the better view, more in accord with basic principle and clearly expressed by Robert Goff J in the passage I have quoted from the BP Exploration case … (4) The application of these principles may be tempered by rephrasing the question as one in terms of when the claimant could reasonably and commercially have expected to be paid. But that has never been applied to extend the starting date beyond the date when a reasonable investigation would have been completed, even if it would have resulted in a decision to resist the claim, and even then it has been used substantially in cases in which the claim can properly be viewed as sufficiently unusual to inspire special investigation or where there is evidence of a commercial practice as to a later date of payment without an interest obligation. (5) Where a claimant assured has been guilty of excessive delay, whether in making the original claim or in pursuing it, then the starting point (or on occasion the rate of interest) may be adjusted adversely to him. The rationale for such an approach has sometimes been expressed as a form of sanction for delay but can, I think, equally and more consistently with principle, be expressed in terms that in such a case it is wrong to view the claimant as kept out of or deprived of the use of money payment of which he has delayed in seeking.”
“I agree with both counsel that in a case of this kind, demand for payment is not an element of the cause of action. The date upon which the builders’ cause of action accrues in a restitutionary quantum meruit claim is not entirely clear. For understandable reasons, there has not been a full citation of the authorities which bear upon this question. Even if, in theory, the cause of action accrues on the date upon which the building is handed over, nevertheless I am quite satisfied that interest should not run from that date. Interest should only run from the date when the sum due is ascertainable. In this regard, most of the relevant information resides with the contractor. In my view, interest should start to run when the contractor has furnished his final account and the building owner has had a reasonable opportunity to assess the final account. This approach accords with the general practice of the construction industry. It is also consistent with the reasoning of Robert Goff J in BP Expiration Co (Libya) Ltd v Hunt…”
“The question whether award of interest is appropriate is a matter of discretion, and if interest is awarded the selection of the date from which interest should be awarded is similarly a matter of discretion. Nevertheless the basic principle is that interest will be awarded from the date of loss: BP Exploration v Hunt… The date of loss marks the inception of the period over which the plaintiff has been deprived of his money. The only point of substance advanced in order to displace that prima facie rule is that Skandia could not have been expected to pay on a claim not yet formulated. The argument has a certain superficial attraction. But in all the circumstances I am satisfied that it ought not to succeed.”
“… for all or any part of the period between the date when the cause of action arose and: … (b) in the case of the sum for which judgment is given, the date of the judgment.”
“(1)… Every judgment debt shall carry interest at the rate of [8] percent per annum from such time as shall be prescribed by rules of court… until the same shall be satisfied…”
“(1) where interest is payable on a judgment pursuant tosection 17 of the Judgments Act 1838 … the interest shall begin to run from the date that judgment is given unless… (b) the court orders otherwise.”
“[Produce] evidence of the rate at which a person with his general attributes (but ignoring his particular position) could have borrowed money over the period.”
“In the interests of a cost-effective administration of civil justice, the courts must adopt a fairly broad brush approach to the award of interest. On the other hand, in light of the over-riding criterion of fairness, the courts are vigilant to ensure that the broad brush approach does not become too blunt an instrument.”
“26 It is right that defendants who have kept small businessmen out of money to which a court ultimately judges them to have been entitled should pay a rate which properly reflects the real cost of borrowing incurred by such a class of businessmen. The law should be prepared to recognise, as I suspect evidence might well reveal, that the borrowing costs generally incurred by them are well removed from the conventional rate of 1% above base (and sometimes even less) available to first class borrowers.”