Lord Wilberforce held (at pages 468 9) that the claim should be made specifically for the foreign currency and to this might be added the alternative "or the sterling equivalent at the date of. ." and that as regards the conversion date to be inserted in the claim or in the judgment of the court, though the date of judgment was a workable date, he would favour the date of payment meaning thereby the date when the court authorizes enforcement of the judgment in terms of sterling, because in some cases, particularly where there was an appeal, the date of judgment might impose upon the creditor a considerable currency risk, Lord Wilberforce further observed (at page 469): In the case of arbitration, there may be a minor discrepancy, if the practice which is apparently adopted (see the Jugoslavenska case , 305) remains as it is, but I can see no reason why, if desired, that practice should not be adjusted so as to enable conversion to be made as at the date when leave to enforce in sterling is given." (The emphasis has been supplied by us.) 558 Lord Cross of Chelsea pointed out (at pages 497 8) that it would be absurd to have one rule with regard to arbitrations on debts expressed in a foreign currency and another with regard to actions on similar debts and that in a case where the defendant failed to deliver foreign currency for the payment of which the judgment was given, the date for its conversion into sterling should be the date when the plaintiff was given leave to levy execution for a sum expressed in sterling.