The Privy Council (Limitation of Appeals) Act 1968 Cth and the Privy Council (Appeals from the High Court) Act 1975 Cth abolished appeals from this Court to the Privy Council subject only to the theoretical exception of an appeal pursuant to a certificate of this Court in a matter involving an inter se question. This represented no mere sea-change. It effected a bifurcation of the previous unified appellate structure into distinct structures: one, in which this Court ordinarily has no role to play, leading to the Privy Council; the other, in which the Privy Council has no role to play, leading to this Court. In the appellate structure leading to the Privy Council, from which all matters involving the exercise of federal jurisdiction are now excluded (Judiciary Act s. 39(2)(a)) the Judicial Committee remains the final appellate court. It is there alone that the Judicial Committee remains of pre-eminent authority in so far as Australia is concerned. In all other areas, this Court is the ultimate appellate tribunal for Australia. As between the Judicial Committee and this Court, there no longer exists the control of conflict in the exercise of judicial powers by different courts which is inherent in the hierarchy of tribunals in a single appellate structure. Nor can the judicial powers of this Court be read back to avoid conflict with the judicial powers of the Privy Council in a manner which may have been appropriate when this Court was part of an appellate structure in which the Privy Council was pre-eminent. If inconsistency exists or arises between the respective judicial powers of the Privy Council and of this Court, it manifests, pro tanto, inconsistency between the statutory foundations of the respective jurisdictions and must be resolved in accordance with ordinary legal principles.
It is clear that, in the event of any such particular underlying inconsistency between the provisions of the Imperial Acts (and Orders in Council made under them) determining and regulating the jurisdiction of the Privy Council and the provisions of the Constitution (and legislation enacted by the Commonwealth Parliament under it) establishing and conferring jurisdiction on this Court, the Constitution (and legislation under it) must prevail by reason of the fact that the Constitution enjoys the authority of the later enactment of the Imperial Parliament. The disagreement between the majority and myself in the Caltex Case was, as I read the majority judgments, restricted to the question whether "any relevant inconsistency" could be discerned in the operation of the respective sets of provisions, according to their terms, to authorize the concurrent appeals to this Court and to the Judicial Committee which the different parties sought to pursue in the particular circumstances of that case (see per Gibbs C.J., Mason, Wilson and Dawson JJ. [29] ).
1. (1979) 145 C.L.R. 246.
2. Ante, pp. 93-101.
3. Ante, p. 96.
4. Ante, p. 80.