Firstly thanks for your help and advice, very much appreciated.

I've fully stripped the gun, I managed to do it without unscrewing the muzzle, it was a job but I managed it; I presume the six holes at the front allow the muzzle to be unscrewed.

I'd welcome your guide as it appears I must have got some of the machanics of the trigger sears wrong as the gun won't click, it jams half way on the stroke. I'll send you my email address if that's ok?

Yes please Mr Gen, I'll pm you my address.

Kind regards

Andy