2. The circumstances in which this payment was made are set out in the case stated. It appears that from 1947 onwards the appellant carried on the business of carrying goods by road for reward on inter-State journeys and that between 12th April 1951 and 30th June 1954 he paid to the Commissioner amounts totalling 54,868 pounds 18s. 10d. as and for prescribed fees for permits pursuant to s. 22 of the State Transport (Co-ordination) Act, 1931-1951 (N.S.W.). The question of the validity of the application of the relevant parts of this Act to persons exclusively engaged in the inter-State carriage of goods was considered by this Court in 1952 (Hughes and Vale Pty. Ltd. v. State of New South Wales [1953] HCA 14; (1953) 87 CLR 49 ) when a majority of the Court followed the decision in McCarter v. Brodie [1950] HCA 18; (1950) 80 CLR 432 and upheld the legislation in its application to inter-State trade. However in 1954 the Judicial Committee of the Privy Council reversed this decision and declared that "the provisions of the Act requiring application to be made for a licence, and all provisions consequential thereon, are inapplicable to the appellant while operating its vehicles in the course and for the purposes of inter-State trade" (1955) AC 241, at p 309; (1954) 93 CLR, at p 35 . This meant that the fees collected from the appellant did not, in law, become payable and in the following year the appellant commenced an action in the Supreme Court of New South Wales in which, ultimately, he claimed to recover the sum of 54,868 pounds 18s. 10d. as and for money had and received by the Commissioner for the use of the appellant. The particulars given show that what the appellant was claiming to recover in this action were the amounts which had been paid by him as and for permit fees between April 1951 and the end of June 1954. The basis of the claim was that these amounts had been "improperly demanded under colour of office". Whether or not the appellant had a legal right to recover these moneys does not appear from the case stated (cf. Mason v. New South Wales [1959] HCA 5; (1959) 102 CLR 108 ) but, except for one aspect of the matter, this is not of much importance in the case. However, it is not unreasonable to infer from the circumstances related in par. 10 (a) and (b) of the case that unless the appellant had paid the fees demanded he would have been prevented from carrying on his business. Those two sub-paragraphs deal with two occasions when, permits not having been obtained by the appellant, officers of the Commissioner unlawfully detained vehicles of the appellant and interfered with the goods which they were carrying. (at p349)