I know the Norwegians had loads of cast-off equipment after the war, we have had large quantities of K98 rifles (chambered 30-06) into the UK recently from Norway.
Maybe this Thompson was given to them post war, but I'm assuming the British Acceptance marks and sling position point to it's original purchaser?
My interest in purchasing it was because I have a 1928 A1, an M1, and an M1A1, so I needed a 1928 to complete the set of WW2 issue models, and a British one seemed perfect.
It's not likely to get shot too often as I prefer to use the M1A1 which was unissued, unfired when I got it so has no period patina.
I agree 100% about the original buyer of the weapon being the British war Office, but I think they would have been passed on 'officially' to the Norwegians rather than just being ‘left’ by a commando on some raid, is what I meant. Some Norwegian forces were based in Britain in the early years of the war, I have some photos somewhere of them in a location called "Glenmore Lodge", with not only Thompsons, but Lugers and other assorted weapons in their armoury. Indeed the Norwegians even used the British Transit Chests for the storage of their weapons, one recently came up for exchange in Norway a colleague informed me, but had high asking ‘price’.
If you are based in the UK, I am intrigued how you can fire Thompsons, intrigued and anxious to find out how I can get the opportunity to fire one again, in the UK? The only opportunity I had to fire them in the distant past, was while serving in a reserve sqn. of the 11 EOD Regt., when attending training at the Kineton Army School of Ammunition. What did they not have there to shoot was the question, their stock of arms and ammunition was incredible, at the time.