L42 To good to be true.

[Buccaneer]

he will be hung out to dry by the Police

Proof house regulations are just that, regulations that are made up and administrated by the proof houses, they are nothing to do with the law and as such the police would not be interested in trying to enforce them. I have no doubt though that if something nasty was to happen then criminal negligence charges would be pursued.
On a point made earlier re the fitting of already proofed parts as spares, all of the gunsmiths that I know would routinely return a repaired firearm for re-proof.
The proofmarks are datable which means that in theory a firearm could be assembled using parts carrying proof marks but it in itself would never have been proofed as a complete gun unless re-submitted.

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