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Tricker's, Crockett & Jones, Church's. Sander's. All 100% U.K. made. There may be others. The other guys in Nottingham do have 100% made in U.K. shoes too, but some of their models are made overseas. Sander's are definitely the best value. They actually have an online outlet for your perusal, too: https://www.sanders-uk.com/shop/category/outlet
I only own a pair of Tricker’s and Sander’s from their Sanders Japan line. The Tricker’s are definitely a step above the Sander’s, but they were also over 150% of the price. The Sander’s Outlet link seems to have some really great deals.
Worth a trip to Northampton I'd say - they all have factory stores and can often pick something nice up.