INTEREST ON PART 36 OFFERS: HOW SHOULD IT BE CALCULATED? GIVING THE CLAIMANT INTEREST ON COSTS BEFORE THEY WERE ACTUALLY INCURRED IS NOT AN ABSURDITY

This is an interesting Part 36 issue in a case where the claimant had beaten its own Part 36 offer.  The court made an order for additional interest from the date of expiry of the offer.  Does the defendant have to pay interest on those costs at an aggregate rate, or does liability for interest run ...