said respective services which said fees in the case of the plaintiff
Browns Transport Pty. Ltd. vary between £47 Os. Od. per annum and £129 16s. 6d. per annum per vehicle and in the case of the plaintiff Downs Transport Pty. Ltd. average approximately £40 Os. Od. per annum per vehicle (b) Fees for inspection of vehicles under The Inspection of Machinery Acts 1951 to 1954 (Q.) Such fees are 10s. Od. per vehicle for each inspection. Inspections are normally made each half-year (c) The cost of number plates issued to it by the Department of Transport under The State Trans- port Facilities Acts 1946 to 1955 (Q.). The cost of number plates is 10s. Od. each; (d) Contributions under The Roads (Contribution to Maintenance) Act of 1957 (Q.). Contributions made under The Roads (Contribution to Maintenance) Act of 1957 have up to the present been allowed as a set-off against the fees payable by licensees under The State Transport Facilities Acts 1946 to 1955. Payments made in respect of (a) and (d) of this paragraph are completely devoted to the construction and maintenance of roads whilst the payments in respect of (b) and (c) do not exceed the costs of the services provided in relation thereto.
22. Certain holders of licenses under The State Transport Facilities Acts 1946 to 1955 being airline operators (but not in fact the plain- tiffs) without objection from the Commissioner for Transport show in their dockets or invoices for fares or freight as a separate charge the levy under the conditions of their licenses some of which contain a provision that the amount of State license fees may be surcharged.
23. It is agreed by the parties that the word levy as used herein is a neutral word.
24. The parties agree that the facts stated in pars. 5, 6, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 20, 21 and 22 are admitted for the purposes of this special case and not otherwise.
25. The parties do not admit the relevance of any fact set out herein. In particular the plaintiffs do not admit the relevance of the facts set out in pars. 7 and 20 herein and the defendant does not admit the relevance of the facts set out in pars. 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 21 and 22 herein.
26. The question for the opinion of the Full Court of the High Court is as follows
Whether a levy made by or under condition no. 17 aforesaid amounts to an attempt to impose a duty of excise contrary to the provisions of the Commonwealth Constitution.
H. T. Gibbs Q.C. (with him H. Matthews), for the plaintiff Browns Transport Pty. Ltd. The levy of a percentage of the gross revenue