Bob,
Someone on the German Gun Collectors forum might be able to help:
http://germanguns.com/

Also, Dale Tate in California may have contacts in England :
http://www.daletategunmaker.com/

Those are all that I can think of at the moment, but I will ask a hunting friend who went to gun smithing school with Dale in England if he has anything to contribute.

Have a safe Independence Day!