"L8A5" for sale....

[Alan de Enfield]

Rifle is described to be British export proof marked and having a commercially proofed barrel.

I wouldn't have expected a "military armourer at unit level" to have had access to a commercial proofed barrel, and the UK doesn't 'export mark' the firearms but the receiving country often marks the with import markings showing where they came from.

The ENGLAND mark commonly found in the USA and is considered by many to be an England EXPORT marking is in fact a pre-1968 import requirement by the US authorities.

There is a saying - "buy the rifle not the story".