Article 21 Interlocutory applications

An application to the tribunal or the chairman to exercise any power under rules 13, 14, 19(4) and 20 shall, if not made in the course of a hearing, be made in writing to the secretary, who shall serve a copy of the application on each of the following persons not being the applicant, that is to say, the appellant, the Controller and every person who has given notice under rule 5(1) of his intention to appear.