Also ....
My Slingsby T31m is registered as Group A (just a term we all uderstand
) because when I first registered it, I was given a choice by CAA registrations at the time. I could have classed it as a SLMG (no TMG then) but was allowed to class it as group A. An odd one I know, but that was the rule then, so mine's an aeroplane not a motor glider. I guess now it would be registered a TMG.
SS