Authorisation of persons to attend a hearing to give evidence or to produce documents
23.—(1) Where a party wishes to call any person to attend a hearing under rule 20 and to give evidence thereat, or to produce documents which relate to any matter in question at such a hearing, he or she shall not later than the expiry of the period within which the prisoner may send written representations to the tribunal under rule 7, make a written application to the tribunal to authorise that person to attend the hearing to give evidence or to produce documents.
(2) Any application under paragraph (1) shall give the name, address and occupation of each person in respect of whom the application is made and a statement of what the general nature of his or her evidence is likely to be.
(3) Any party who makes an application under paragraph (1) shall, at the same time as the application is made, send a copy of that application to the other party.
(4) The chairman of the tribunal may grant or refuse an application under paragraph (1) and shall give each party written notice of his decision and, where the application is refused, of the reasons for that decision.