"Nor do I see any injustice, in principle, in an order under paragraph (3)(b) of rule 36.21 for the payment of interest on the costs which are the subject of the order which I would make under paragraph (3)(a). The purpose for which the power to order interest on cost under that paragraph is conferred is, I think, plain. It is to redress, in a case to which rule 36.21 applies, the element of perceived unfairness which arises from the general rule that interest is not allowed on costs paid before judgment: see Hunt v RM Douglas (Roofing) Ltd. So, in the ordinary case, the successful claimant who has made payments to his own solicitor on account of costs in advance of the trial will be out of pocket even if he obtains, at the trial, an order for costs on an indemnity basis. He will get interest on his costs from the date of the order (whether he has actually paid them or not); but he will get nothing to compensate him for the cost of money (or the loss of the use of money) which he has had to bear before trial in relation to payments which he has made on account of costs. An order under paragraph (3)(b) of rule 36.21 enables the court to achieve a fairer result in that respect. But, having regard to the point which, as it seems to me, paragraph (3)(b) is intended to meet, I would order payment of interest at a rate which reflects (albeit generously) the cost of money, say, 4 per cent over base rate; and I would direct that interest runs, on the costs to which the order applies, from the date upon which the work was done or liability for disbursements was incurred."
"The court may also order that the claimant is entitled to (a) his costs on the indemnity basis from the latest date when the defendant could have accepted the offer...; and (b) interest on those costs at a rate not exceeding 10 per cent above base rate."