'In the Wrap' values?

[Alan de Enfield]

, it will always be unwrapped in the Uk so it can go through proof. .

It is quite legal to own a non-proofed (prooved) firearm in the UK, you cannot buy one and you cannot sell one but you can be given (or give) one.

Edit to add - Info from the 2013 Home Office Guidance

24.3 The proving of firearms is governed by the Gun Barrel Proof Acts of 1868, 1950 and 1978 (However, note that much of the 1950 Act was repealed in 1996 by SI 1996/1576).
Under these Acts it is:

(a) an offence to sell, exchange, expose or keep for sale, or export, or keep for exportation, or to attempt to sell, exchange or export, or to pawn or pledge, or attempt to pawn or pledge, or to take in pawn or pledge, an arm, the barrels of which are not duly proved and marked as proved (section 108 and 109 of the 1868 Act);

(b) an offence to import into the United Kingdom small arms, the barrels of which are not duly proved and marked as proved, without giving notice in writing within seven days to either the London or Birmingham Proof House or to send such imported arms, within twenty-eight days of their arrival in the United Kingdom, to be proved at either the London or Birmingham Proof House (Section 122 of the 1868 Act).

This does not apply to any small arm imported by any person for their own personal use whilst it is in their possession. In such a case, the proof is the responsibility of the possessor.