16.—(1) At any time before it is determined, an application to a Commissioner for leave to appeal against a decision of an appeal tribunal may be withdrawn by the applicant by giving written notice to a Commissioner of his intention to do so.
(2) At any time before the decision is made, an appeal to a Commissioner may, with the leave of a Commissioner, be withdrawn by the appellant.
(3) A Commissioner may, on application by the party concerned, give leave to reinstate any application or appeal which has been withdrawn in accordance with paragraphs (1) and (2) and, on giving leave, he may make such directions as to the future conduct of the proceedings as he thinks fit.