Australian Constitution - Section 74 - Appeal to Queen in Council
No appeal shall be permitted to the Queen in Council from a decision of the High Court upon any question, howsoever arising, as the the limits inter se of the Constitutional powers of the Commonwealth and those of any State or States, or as to the limits inter se of the Constitutional powers of any two or more States, unless the High Court shall certify that the Question is one which ought to be determined by Her Majesty in Council.
The High Court may so certify if satisfied that for any special reason the certificate should be granted, and thereupon an appeal shall lie to Her Majesty in Council on the question without further leave.
Except as provided in this section, this Constitution shall not impair any right which the Queen may be please to exercise by virtue of Her Royal prerogative to grant special leave of appeal from the High Court to Her Majesty in Council. The Parliament may make laws limiting the matters in which leave may be asked, but proposed laws containing any such limitations shall be reserved by the Governor-General for Her Majesty's pleasure.