During the war, we paid the Bren royalties into a UKbank. As did Canada
(who built them under licence to us because Inglis was a private manufacturing agency) and as did Australia
who DID build them, under the same agreed licence at a Govt. Ordnance factory.
Once the war was going hammer and tongs, we did vary production without a second thought and the only thing that was a sticking block that I can uncover, was the use of a UK BA thread for the Mk2 folded foresight protector
Incredibly, Singer were STILL making and exporting sewing machines to Nazi Germany, via neutral Spain (although some say it was Portugal.....) until early 1941