“23 Fifth, in terms of what justice requires, I do not think it just to make an order under which interest begins to run at the rate appropriate for unpaid judgment debts before the paying party could reasonably be expected to pay the debt; and, in a case where the court has ordered a suitable interim payment to be made on account of costs, I do not think it reasonable to expect the party liable for costs to pay the balance of the debt until it knows exactly what sums are being claimed by the party awarded costs and has had a fair opportunity to decide what sums it accepts are properly payable. It is this principle which seems to me to have informed the approach of Roth J in the London Tara Hotel case, when he could see no reason why the judgment rate should apply “before the amount which has to be paid is known”
“… Moreover, if one accepts, as I do, that in principle the court has power to make an order for damages or costs expressed in a foreign currency, then it seems to me to follow as matter of logic that the court ought to have power, if it decides to make an order in sterling, to compensate for any exchange rate loss. Moreover, it seems to me that there is, as counsel for Elkamet submits, a powerful analogy between an award of interest on costs and an award of exchange rate losses on costs. 12. Turning to the argument of practicality, counsel for Saint-Gobain points out that exchange rates go up as well as down, as indeed the evidence in the present case confirms. Thus, although the exchange rate as at the date of payment of the last invoice was 1.14, yesterday it was 1.17. Counsel further submits that satellite litigation over issues like exchange rates should be discouraged. Furthermore, he points out that the relevant date is not the date of yesterday's exchange rate (which is the most recent information available to me), but the date of payment. 13. It seems to me that these are all arguments that have some force. Nevertheless it seems to me that they do not detract from the basic principle identified by counsel for Elkamet, namely, that the order for costs is designed to compensate the successful party for its expenditure. If it is a foreign company which has had to exchange its local currency into sterling in order to pay costs as the litigation has gone on, then it seems to me in principle the successful party is entitled to be compensated for any additional expenditure it has had to incur as a result of exchange rate losses in the same way as it is entitled to be compensated by way of interest for being kept out of the money. 14. Nevertheless, it seems to me the arguments of practicality identified by counsel for Saint-Gobain do support a cautious approach to the quantification of such matters. One thing that I have to bear firmly in mind is that I do not have a crystal ball, and therefore am not going to be in a position to predict what the exchange rate is going to be at the date of payment.”