The substantial issue between the parties in the present case, both at first instance and on the successive appeals, was the liability of the Council to compensate the applicants for the damages which they sustained by reason of their reliance upon the erroneous information. The claim for interest now in question was not really appropriate to be included in the statement of claim: the occasion for the claim for interest only arose if the trial judge dismissed the substantive claim and it was subsequently held on appeal that he had been in error in so doing. If the learned trial judge had correctly found in favour of the applicants and his judgment had been upheld or restored on appeal, interest would have been automatically payable at the prescribed rate of 10 per cent per annum in respect of the relevant period without any need for an order in that regard (Supreme Court Act 1970 N.S.W., s. 95). The question whether the Council should be ordered to pay interest on any damages which the applicants proved they had sustained was a subsidiary or consequential question which only arose when the substantial issue between the parties as to liability and resulting damages had been determined. It should, of course, have been mentioned in the notices of appeal. Nevertheless, in the circumstances, we consider that it is competent for this Court, pursuant to the slip rule, to amend the Court's previous order to make provision for interest upon the damages, to which the applicants have been held to be entitled, for the period between the date on which judgment was given in the Supreme Court and the date on which the orders were made in this Court on appeal. It is not disputed on behalf of the Council that, if interest is to be awarded, the appropriate rate is 10 per cent per annum. In the result, we conclude that the order of this Court should be amended by including, in the sum for which judgment is given in the substituted order of Waddell J., an amount of $62,713, being interest at the rate of 10 per cent per annum on the sum of $173,938 for the period from 20 March 1978 to 28 October 1981. The application having been made necessary by the failure on the part of the applicants to seek an order on the hearing, they should be ordered to pay the Council's costs of the present application.