Thank you to all for your helpful advice and suggestions. I am revisiting my gunsmith soon to see if he can rectify the issue. I will make notes of the various points that have been included this forum and discuss these with him.

I really like using the Boswell on clays at my local clay target club and hope it can be repaired soon. Using an unreliable gun on the range is certainly a sure way to break your concentration and confidence that the next shot fired will actually go bang.

Cheers to all.