There is evidence that on 31st July 1968 the building surveyor of the plaintiff, acting with its authority, approved the building application of the defendant subject to certain notations and conditions which need not here be set out. The defendant commenced the work of erecting the building. On 29th October 1968 the plaintiff, by an originating summons in the Supreme Court of New South Wales, sought an injunction restraining the defendant from carrying on any building operations in or on the building then in course of construction, except between the hours which had been specified in condition (f) set out above as those to which the hours of work were to be limited. A temporary injunction was granted ex parte and, subsequently, further interim injunction orders were made. When the suit came on for hearing on 7th March 1969 before Helsham J. it was dismissed. His Honour said in his judgment that it was quite clear that the defendant claimed that it was entitled to operate and threatened to continue to operate outside the stipulated hours unless restrained by the order of the Court. The ground on which Helsham J. held that the suit failed was that in his view there was no relevant connexion between the condition imposed as to the hours of work and the implementation of planning policy and, therefore, it could not be validly imposed as a condition of consent to the development application. Upon an appeal to the Court of Appeal of the Supreme Court, it was held that the plaintiff had power to impose the condition and was entitled to succeed in its suit. However, as the erection of the building had then been completed the Court did not grant any injunction. It ordered that the appeal should be allowed, that the decretal order made by Helsham J. should be set aside and that in lieu thereof there should be an order that the defendant pay the cost of the proceedings before Helsham J. and of the appeal. From that order the defendant has appealed by special leave to this Court.