The broader abolition movement: The Privy Council (Limitation of Appeals) Act 1968 was part of a deliberate and systematic process by the Australian Parliament to assert judicial independence. Before this Act, Australian parties could appeal to the Privy Council from many Australian court decisions, including High Court decisions on state law matters and from state courts directly.
The 1968 Act's contribution was to cut off the pathway from High Court decisions in the large category of constitutional and Commonwealth statutory matters: the most legally significant decisions of Australian courts. After 1968, Privy Council review was confined to a relatively narrow group of non-federal State law matters decided by the High Court on appeal from a State Supreme Court.
The 1975 Act completed the High Court pathway: The Privy Council (Appeals from the High Court) Act 1975 removed the remaining section 3 pathway, so that from 1975 no High Court decision could form the basis of a Privy Council leave application regardless of its subject matter.
The Australia Acts 1986 completed the project: The Australia Acts 1986, enacted by both the Commonwealth and UK Parliaments, removed the remaining direct appeal pathways from State courts to the Privy Council. From 1986, no Australian court decision was subject to Privy Council review.
Pre-existing proceedings: The Act's saving provision for proceedings commenced before commencement (s 3(2)) was practically important during the transition period. Parties who had commenced State Supreme Court proceedings before the Act's commencement retained any rights to Privy Council review that had existed before the Act. The transitional cut-off meant parties had some certainty about their existing litigation positions.
Relationship to section 74 of the Constitution: Section 74 of the Constitution provides for appeals to the Privy Council in matters involving the interpretation of the Constitution or a law relating to the application of the Constitution as between the States and the Commonwealth, but makes such appeals subject to certification by the High Court. The High Court has never certified such an appeal. The 1968 Act operated outside the section 74 context, dealing with the more general categories of appeals in non-constitutional State law matters.
Constitutional basis for the Act: The 1968 Act was legislation by the Commonwealth Parliament restricting the ability of parties to seek Privy Council leave. Its constitutional validity was not in doubt, given the Commonwealth Parliament's power to legislate with respect to the judicature under Chapter III of the Constitution and the ability of Parliament to define and restrict the appellate structure above the High Court.
Why the Act remains in force: Although the Australia Acts have rendered the Act practically inoperative, it has not been formally repealed. Its continued presence in the statute book reflects the completeness of the statute consolidation rather than any ongoing operational requirement.