63.9. The Crown Court may—
(a)shorten or extend (even after it has expired) a time limit under this Part;
(b)allow an appellant to vary an appeal notice that that appellant has served;
(c)direct that an appeal notice be served on any person;
(d)allow an appeal notice or a notice of abandonment to be in a different form to one set out in the Practice Direction, or to be presented orally.