Unfortunately, ever since the RAF dumbed down UAS training, 22Gp won't accept that it meets Part-FCL requirements. So consider yourselves screwed by your own system....
However, UAS training
is still accepted towards the NPPL (SSEA). See
http://www.nationalprivatepilotslice...20REV%2010.pdf pp 5-7. So you can obtain an NPPL, then convert it to a LAPL(A) and thence to a Part-FCL PPL(A). Regrettably this tortuous process is the simplest way to maximise the benefits of your experience, unless HQ UAS can persuade 22Gp to review its accreditation policies.