19.—(1) Where a party wishes to call witnesses at the hearing, he shall make a written application to the Commissioners, a copy of which he shall serve on the other party within 16 weeks of notification of listing, giving the name, address and occupation of the witnesses he wishes to call and the substance of the evidence he proposes to adduce.
(2) The chairman of the panel may grant or refuse an application under paragraph (1) and shall communicate within 7 days his decision to both parties, giving reasons in writing, in the case of a refusal, for his decision.