Belts that are of the “belt” type consisting of a fabric or metal belt, are not a reproduction and were originally designed or manufactured for the purpose of feeding cartridges into a automatic firearm of a type that was in existence before 1945, are exempt from the magazine capacity regulations.
Apparently when a commons committee was hearing presentations re the forthcoming magazine restrictions, someone made a presentation about historic large capacity magazines, which the politicians accepted. For instance, you can own a 100 round bren drum magazine in unpinned form (I do
) but you have to pin the common 30 round Bren magazine.
I am hoping that someday someone brings in a legal semi auto Bren for sale in this country.