10.—(1) The Secretary of State may by notice given to the registered keeper revoke a reduced pollution certicate—
(a)if he is satisfied, in consequence of a re-examination under paragraph 9(3) that an eligible vehicle for which the reduced pollution certificate is in force no longer satisfies the reduced pollution requirements; or
(b)if the registered keeper of an eligible vehicle who has been required to submit it for re-examination under paragraph 8 or following a rectification notice has failed to do so in accordance with this Schedule.
(2) A reduced pollution certificate which has been revoked by notice under paragraph (1) shall cease to have effect on the date specified for that purpose in the notice.
(3) Where a notice has been given in respect of the eligible vehicle under paragraph 8(1) or 9(3), the notice under paragraph (1) shall not be given before the end of the period for submitting the vehicle for a further examination specified in the notice under paragraph 8(1) or, as the case may be, 9(3).
(4) The registered keeper of a vehicle for which a reduced pollution certificate is in force may at any time surrender the certificate to the Secretary of State for cancellation, whereupon the certificate shall cease to have effect.
(5) Where a certificate is revoked in accordance with paragraph (1) the registered keeper shall surrender the certificate to the Secretary of State for cancellation within the period specified for this purpose in the notice given under paragraph (1).