Subject to the provisions of this Act, the Court of Appeal—
shall allow an appeal against conviction if they think that the conviction is unsafe; and
shall dismiss such an appeal in any other case.
In the case of an appeal against conviction the Court shall, if they allow the appeal, quash the conviction.
An order of the Court of Appeal quashing a conviction shall, except when under section 7 below the appellant is ordered to be retried, operate as a direction to the court of trial to enter, instead of the record of conviction, a judgment and verdict of acquittal.