I'm surprised that so many brand new rifles were released to commercial sale if the war stock rifles were so "well used".
Having said that, we (the canadian gov't and military anyway) have made disposing of stored arms a habit ( Inglis Hi Powers + No4 rifles as just 2 examples) resulting in a need to canabalize new guns in stores, and purchase beaten debris from the open market to suplement systems still in use...
My 90L long branch was inspected by V.Ball in 1961 or 1962.
I believe the only firing was at conversion and after MOD released it.
That raises the question of
British
commercial proofing...are they actually ALL proof fired??
I'm really not sure how my "mummy wrapped" 1955 Fax mk2 was proof fired?? Without being unwrapped (except at the muzzle and serial number on receiver side).