9.—(1) Subject to sub-paragraphs (2) and (3), an appeal on a question of law shall lie to the Court of Appeal from any decision of a Commissioner.
(2) No appeal under this paragraph shall lie from a decision except—
(a)with the leave of the Commissioner who gave the decision or, in a prescribed case, with the leave of a Commissioner selected in accordance with regulations; or
(b)if he refuses leave, with the leave of the Court of Appeal.
(3) An application for leave under this paragraph in respect of a Commissioner’s decision may only be made by—
(a)a person who, before the proceedings before the Commissioner were begun, was entitled to appeal to the Commissioner from the decision to which the Commissioner’s decision relates;
(b)any other person who was a party to the proceedings in which the decision to which the Commissioner’s decision relates was given;
(c)any other person who is authorised by regulations to apply for leave,
and regulations may make provision with respect to the manner in which, and the time within which, applications must be made to a Commissioner for leave under this paragraph, and with respect to the procedure for dealing with such applications.