5.—(1) Any person who is an applicant for a certificate or in respect of whom a certificate has been issued—
(a)shall furnish to the Secretary of State such information and evidence relating to his circumstances as the Secretary of State may require on the making of the application and from time to time thereafter; and
(b)shall notify the Secretary of State of any change in his circumstances which might effect the cancellation of the certificate; and
(c)shall comply with any notice given to him by the Secretary of State which requires him to submit himself to medical examination for the purposes of determining whether he satisfies the condition specified in regulation 3(2)(b).
(2) The requirements of regulation 7 of the principal regulations as to notices given for the purposes of that regulation shall apply to notices given for the purposes of paragraph (1)(c).