I presume you mean revalidated the SEP rating by experience.
The UK licence is issued in accordance with ICAO standards. The rest of the world sees it as an ICAO licence, it's only the CAA who have (had) funny ideas about its validity in comparison to Part.FCL licences, also issued in accordance with ICAO standards.
I kept my ratings signed on both my UK and Part.FCL licences at each revalidation. In relation to the SEP rating, as the CAA don't have a specific form for notification on the UK licence, I sent them a single SRG1119E each revalidation. Two licence signatures but a single form.