BEagle many thanks for the reply - it is all becoming a bit clearer!
I have the possibility of flying an aircraft that is shown in LASORs Appendix D - list of "Motor Gliders Classed as SLMG and TMG".
So are you saying that I can fly it on my existing SLMG class rating, but that I could not log it with my SEP hours unless I get a TMG rating?
In the UK for licencing purposes there is no destinction between SLMG and TMG aircraft
So why are there two seperate class ratings, or have I misunderstood this bit?