My understanding is that the UK CAA PPL(Microlight) was conceived as a sub-ICAO Licence, and the concept of adding 'Class Ratings' (A term yet to be invented) was never envisaged, .....at the time.
Times change, however, as we know to our cost, and these days, anything seems to be possible. As Whopity points out, The SEP Class Rating may not be included in Schedule 7, but this does not preclude any Class Rating being added to any UK CAA Licence that the UK CAA may think fit.
I suspect, however, that the CAA will view the CAA PPL(Microlight) in the same light as the NPPL(M) and although they may be happy to add an SSEA Class rating, the SEP will remain associated only with the full (ICAO) CAA/EASA PPL(A).
Best route for Rick, is to convert what he has now, (still not clear if this is an NPPL(SSEA) or Old CAA PPL(Microlight) with SSEA added) to a LAPL. That will solve his immediate requirement regarding his Europa and hiring EASA 4 seaters, and then upgrade to a full EASA PPL(A) in the future, if/when he wants to add an IMC/IR(R), or IR.
MJ
