You won't get much more on Bonehill than Pete has published. Nigel Brown's book retails for around £60 here in England so is not a cheap book. It is mainly a directory of British Gunmakers. I have just ordered volume 3 that is out soon. Someone, whose name escapes me, has taken over the Bonehill name. Try digging on the web and you might find it. I do know that Salopian knows him and may well spot this post. Lagopus.....