It all looks quite good but I don't have any photographic evidence to confirm. Certainly old oil-based paint and all applied in the correct way.
I have quite a number of photographs of Canadian Nortons around 1942/43 showing the census number on the front mudguard. I suspect that it may have been because they were so keen on putting the maple leaf on the fuel tanks.
However, Canada didn't officially take any BSAs but photos exist showing that they sometimes acquired them.
If it were mine, I might take a look at the war diary for the Argyll & Sutherland Highlanders of Canada to see if they refer to BSAs.
The Canadians had hundreds, probably thousands of Harley's (Model WLC) They were prepared to a different spec to the US WLA's. different mudguards and interchangeable wheels, British style rear lamps, and a handlebar clutch lever....To mention just some of the differences. Ron