"...the Crown BNP and the 9 tonnes markings..." Like Joe W says, those would be standard 'sold through Englandicon' marks. Proofing was required for any milsurp rifle sold by surplus rifle dealers in England. Nothing whatever to do with Canadaicon. 18 tons per Sq inch(a wee box with ".) though. http://www.thegca.org/glossary-terms2.pdf
"...on an unofficial basis..." Met a 2PPCLI vet, long ago, who was at Kap Y'ong. Said he didn't care if the .30 Carbine took two rounds, he loved the M1icon Carbine. 1,000 M1 Carbines and 1 million rounds of ammo were para-dropped to 2PPCLI when they stopped the Chinese advance. The PPCLI has done that in every war they've been in since W.W. I. Kind of surprising that their motto is 'Once a Patricia, Always a Patricia" instead of just 'Stand'.