A person who wishes to appeal under this Part of this Act to the Court of Appeal, or to obtain the leave of that court to appeal, shall give notice of appeal or, as the case may be, notice of application for leave to appeal, in such manner as may be directed by rules of court.

Notice of appeal, or of application for leave to appeal, shall be given within twenty-eight days from the date of the conviction, verdict or finding appealed against, or in the case of appeal against sentence, from the date on which sentence was passed or, in the case of an order made or treated as made on conviction, from the date of the making of the order.

The time for giving notice under this section may be extended, either before or after it expires, by the Court of Appeal.