Sch 20 para 2
An appointment under section 114(1)(a) of this Act must be in writing and— (a) may relate to any particular appeal, matters or questions specified in the appointment or to appeals, matters or questions of a description so specified; (b) may provide for any function to which it relates to be exercisable by the appointed person either unconditionally or subject to the fulfilment of such conditions as may be specified in the appointment; and (c) may, by notice in writing given to the appointed person, be revoked at any time by the Secretary of State in respect of any appeal, matter or question which has not been determined by the appointed person before that time.