H C Sleigh Ltd v South Australia

The High Court of Australia considered an appeal by H C Sleigh Ltd against a decision of the Supreme Court of South Australia concerning the validity of certain regulations made under the *Petroleum Products Regulation Act 1967* (SA). The dispute arose from the imposition of a levy on petroleum products, which H C Sleigh Ltd argued was beyond the scope of the Act and therefore invalid.

The central legal issue before the High Court was whether the regulations, specifically those imposing a levy on petroleum products, were authorised by the *Petroleum Products Regulation Act 1967* (SA). This involved an examination of the Act's provisions to determine the extent of the power granted to the Executive Council to make regulations and whether the levy fell within that delegated authority.

The Court, in its joint judgment, held that the regulations were invalid. It reasoned that the Act did not confer power to impose a levy on petroleum products for the purpose of raising revenue. The power to make regulations was limited to matters of regulation and control of petroleum products, not to the imposition of taxes or levies. The Court applied the principle that delegated legislative power must be exercised within the confines of the empowering statute, and that any attempt to exceed that authority would render the subordinate legislation invalid. The appeal was allowed, and the regulations were declared invalid.