30.—(1) A surveyor may extend the period of validity of an IBWM Certificate issued in respect of a United Kingdom ship by endorsing that Certificate if—
(a)a renewal survey has been completed by the surveyor;
(b)the surveyor is satisfied of the matters in regulation 26(1)(b) (issue of IBWM Certificates by a Certifying Authority in respect of United Kingdom ships); and
(c)a new IBWM Certificate cannot be issued or placed on board the ship before the date on which the existing IBWM Certificate is due to expire.
(2) Where an IBWM Certificate has been endorsed under paragraph (1), that Certificate is valid for such further period as is specified in the Certificate, not exceeding five months beginning with the original date of expiry of the Certificate.