(1) On a reference to the Tribunal, the persons to act as members of the Tribunal for the purposes of the reference are to be selected from the panel of chairmen or the lay panel in accordance with arrangements made by the President for the purposes of this paragraph ("the standing arrangements").
(2) The standing arrangements must provide for at least one member to be selected from the panel of chairmen.
(3) If while a reference is being dealt with, a person serving as member of the Tribunal in respect of the reference becomes unable to act, the reference may be dealt with by -
(a) the other members selected in respect of that reference; or
(b) if it is being dealt with by a single member, such other member of the panel of chairmen as may be selected in accordance with the standing arrangements for the purposes of the reference.
(4) If it appears to the Tribunal that a matter before it involves a question of fact of special difficulty, it may appoint one or mor