Alexander Henry of edinburgh, stunning workmanship, beautiful guns. As someone said earlier, some of the irish made guns were amazing too, i've been lucky to handle a few (Kavanagh and Trulock and Harriss) and they were top class, and don't forget Rigby started in Dublin.
George Gibbs of Bristol, probably better know for their rifles, but i presume their shotguns were of a similar high quality. The shooting times magazine asked 10 people they considered the best game shots in the uk, what guns they thought were best. Amazingly several of them stated Edwinson Green were guns they would be very happy to use and they really liked.