4(1)A member of the tribunal appointed by the Secretary of State shall hold and vacate office in accordance with such terms and conditions (both as to his term of office and otherwise) as may be determined by the Secretary of State at the time of his appointment and, on ceasing to hold office, be eligible (subject to the following provisions of this paragraph) for reappointment.
(2)Subject to sub-paragraph (3) below, a person shall not be appointed as a member of the tribunal by the Secretary of State for a term extending beyond the end of the completed year of service in which he reaches seventy.
(3)Where the Secretary of State considers it desirable in the public interest that a person should be appointed for a term exceeding that allowed under sub-paragraph (2) above, that person may be appointed for such term, not extending beyond the date on which he reaches seventy-five, as the Secretary of State thinks fit.
(4)A member appointed by the Secretary of State may at any time by notice in writing to the Secretary of State resign his office.