18.—(1) Every holder of a certificate of entitlement issued in respect of a motor vehicle shall, within 3 months or, in the case of a non-transferable certificate of entitlement, within 6 months from such date as the Registrar may specify in the notification under rule 12(2) or within such further period as the Registrar may approve, register the motor vehicle.
(2) Where on the expiration of the 3 months or, in the case of a non-transferable certificate of entitlement, 6 months or further period no such vehicle is registered, the certificate of entitlement shall be void and any deposit paid in respect of the certificate of entitlement under rule 7(2) shall be forfeited.
(3) The date to be specified by the Registrar shall not be prior to the date of notification under rule 12(2).