...paying the instructors for training in a BGA enviroment is not a commercial transaction??? The BGA is clear when it states non commercial enviroment.
Just because they are non-commercial doesn't mean they are not allowed to employ people. There is far more to instructing than just flying; I have on several occasions been paid to instruct & my feet haven't left the ground. Under EASA, any PPL or SPL holder with an instructor's rating can be paid to instruct, ie per hour of flight instruction, so you might as well get used to it.
...pays a club to gain a NPPL on a motorglider and it uses BGA instructors who do not hold CAA / JAR FI ratings (just BGA ratings)
as squawking 7700 pointed out, an NPPL SLMG instructor's rating is a CAA rating, not a BGA rating.
...why do the CAA not recognise the hours towards the issue of an EASA [licence]
They do.
Because JAR licences required JAR instructors.
With respect to the work on the aircraft under the BGA CAMO are ALL BGA inspectors licenced by the CAA as aircraft engineers?
BGA inspectors can only sign off maintenance on gliders & what EASA call self launch sailplanes. The guys responsible for the maintenance of
TMGs & tug aircraft are CAA licenced engineers. Don't forget M.A.803 mentioned above.