well little update, the black fruit pastel thingy looks well passed it's sell by date lol, so new one of them tomorrow.
played with the black switch box thing and loosened the locking nut and re-assembled the lot, works like it used to now but still leaks at the switch but when i pull the little 6mm pipe from the non return valve it is bleeding air so i think it is the valve at fault.

thank you for all advice recieved

jas