Actually up until a few years ago and at the behest at the CIP [an insidious institution in my opinion that has far over stepped its origins]the only guns that were recorded at either proof house was those that had failed proof . The Proof houses were exempt from our Fire Arms Acts so there was no requirement for the to do so .
We are how ever members of the European Union another insidious bunch , EU laws over ride British Law and EU Firearms Directives have brought the Proof house in line with these .
Proof should be about safety that's all .