“10. For my part, I think it may well be appropriate, at least in substantial proceedings involving commercial interests of significant interest both in balance sheet and reputational terms, that the court should award interest on costs under the rule where substantial sums have inevitably been expended perhaps a year or more before an award of costs is made and interest begins to run on it under the general rule… I have no difficulty in accepting that costs of such an order [£16m ] have had to be financed and paid over a substantial period of time… I would consider it appropriate in principle to award interest upon such costs from payment to judgment.”