Nothing in sections 668 to 672 shall affect the pardoning power of the Governor on behalf of the Sovereign, but the Crown Law Officer, on the consideration of any petition for the exercise of the pardoning power having reference to the conviction of any person or to any sentence passed on a convicted person, may—
(a) refer the whole case to the Court, and the case shall be heard and determined by the Court as in the case of an appeal by a person convicted; or
(b) if the Crown Law Officer desires the assistance of the Court on any point arising in the case with a view to the determination of the petition, refer that point to the Court for its opinion thereon, and the Court shall consider the point so referred and furnish the Crown Law Officer with its opinion thereon accordingly.