As a PS I am like most people In the British gun trade concerned with the problem and agree whole heartedly that a solution needs to be found.

But , this is our problem and endless discusion on an American web site is not the answer. Discussion within the British Trade and investigation by the Proof Houses is what is needed . If indeed London is "blowing up barrels " then use Birmingham as they do not seem to have the same problem.
I say again this is a British problem ,washing our dirty linen in public is not going to help.