5.—(1) An agreement for the purposes of regulation 4(1)—
(a)may either relate to a specified period or apply indefinitely; and
(b)subject to any provision in the agreement for a different period of notice, shall be terminable by the worker giving not less than seven days’ notice to the employer in writing.
(2) Where an agreement for the purposes of regulation 4(1) makes provision for the termination of the agreement after a period of notice, the notice period provided for shall not exceed three months.