Originally Posted by aircraft
Now it would appear that many of the BGA registered motor gliders are maintained to a similar standard...
Wrong again. Look at G_INFO & you will see that they are EASA aircraft & are maintained in accordance with Part-M. They are not permit aircraft.
... yet training is allowed by significantly less qualified flying instructors for a national licence...
They are appropriately qualified. The CAA have been happy to issue licences to their students for years, EASA will be converting those licences into LAPL(A)s.
...as long as that is in a non commercial enviroment.
Yes. And EASA have no problem with these instructors being paid to fly, so long as they have a PPL & instructor's rating.