4(1)Subject to sub-paragraph (2) and without prejudice to any provision of Schedule 4, the Appeals Board may regulate its own procedure.
(2)Where any member of the Appeals Board is indisposed or is for any other reason unable to act, the chairman of the Board may direct that any particular appeal or appeals of any class may be heard by or continued before, and may be determined by, two members of the Board, and for the purposes of the provisions of this Act relating to appeals to the Board those two members shall constitute the Board.
5The validity of the proceedings of the Appeals Board shall not be affected by any vacancy in the office of chairman or other member of the Board or by any defect in the appointment of the chairman or any other member.