For a renewal less than 5 years expired, then a JAA examiner can complete the SRG1119 and sign the rating page. If its over 5 years and the CAA have to re-issue the SEP rating they will probably want a copy of the examiners authorisation to accompany the SRG1119. Only the CAA can sign the page if its expired more than 5 years and in any case they will issue a new page.
A UK C of R for SEP has never had a 1 year validity period, that is for ME Class and Types.