Feel my pain , same size feet as you , but i live very near street (somerset) the shoe capital (clarks shoes & their european distribution center) and i struggle like you to find any , clarks range (not cool) end between size 10- 11 maybe with 1-2 pais of grandad shoes ,
Then to further annoy there is a big man shop , but the shoes in here start at size 14/15 up to 19 ,
mini rant over