27.—(1) Subject to paragraph (2) below, at any time not earlier than six months nor later than one month before the expiration of the last registration of a trade mark, the registrar shall (except where renewal has already been effected under rule 28 below) send to the registered proprietor notice of the approaching expiration and inform him at the same time that the registration may be renewed in the manner described in rule 28 below.
(2) If it appears to the registrar that a trade mark may be registered under section 40 at any time within six months before or at any time after the date on which renewal would be due (by reference to the date of application for registration), the registrar shall be taken to have complied with paragraph (1) if she sends to the applicant notice thereof within one month following the date of actual registration.