8.—(1) A person who, in consideration of—
(a)being permitted to undergo a course of instruction of a duration of not less than 8 weeks, or
(b)receiving any other benefit or advantage,
consents in writing to be restricted in the exercise of the rights conferred by regulations 4 or 7 to be discharged or transferred to the reserve shall not exercise such rights before the expiration of the appropriate period which shall be specified in such consent and shall begin with the date on which he completes such course of instruction or such other date as is mentioned in such consent.
(2) In this regulation “appropriate period” means—
(a)in relation to permission to undergo a course of instruction, a period of not more than 18 months, and
(b)in relation to the receipt of any other benefit or advantage, a period of not more than 4 years 6 months.