Hi again,
Yes, I did the full LST and sent the paperwork off to the CAA (the JAA equivalent of the SRG1119 because I did it in France). I'd previously spoken to the CAA and got the process sorted out - the person I spoke to just said "ah, non expiring licence, you need an LST and there's no fee for the renewal" but didn't think to ask about asking about the extra pages for the licence.
Looks like I better get that sorted then...