Im going to take a different slant on this.

More in the direction of equivalency, which I see as a more accurate or more representative, understanding of the original question.

The UK trade, is now represented by the Italians and the Spanish.

The brands that specify and order shotguns for retail arent ordering UK made shotguns to be finished to their specifications.

So the equivalent to the Birmingham trade in my view, is the Italian and Spanish trade.

Out there doing it best I can.