“(4)  When any person has, in a trial before the High Court acting in the exercise of its original criminal jurisdiction, been convicted of an offence and the Public Prosecutor is of opinion that any point or points of law arising on the trial which has or have not been reserved under this section ought to be further considered, the Public Prosecutor may certify accordingly under his hand and thereupon the Court of Appeal may review the case or such part of it as is necessary and finally determine the point or points and thereupon may alter the sentence passed and pass such judgment and sentence as that Court thinks fit in like manner as though the point or points had been reserved under subsection (1).”.