21.—(1) In any proceedings, on the death of a party to those proceedings, the relevant authority may appoint such person as it thinks fit to proceed with the appeal in the place of the deceased.
(2) A grant of probate, confirmation or letters of administration in respect of the deceased, whenever taken out, shall have no effect on an appointment made under paragraph (1).
(3) Where a person appointed under paragraph (1) has, prior to the date of such appointment, taken any action in relation to the appeal on behalf of the deceased, the effective date of appointment shall be treated as the day immediately prior to the first day on which such action was taken.