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There are a few about with some googling. But I went to Cotswold camping in Betws y Coed. They had (not sure if it's still the case) a couple of guys who were incredibly knowledgeable and spent a lot of time with me. I think it was around an hour and a half working through my foot shape, suitable options, intended use etc.
I have heard that Whalley warm and dry are very good, they are South lakes, and have sorted out my cousin and his very narrow feet.
How did you find the foot fitter?