Mid Wales Music, Newtown. Great 'traditional' music shop. Good range of interesting s/h and new kit at variable prices (some bargains, some fair, some ???). It has been going a long time, I bought one of my basses there in 1990, bought most recent two years ago. Phil has done well to compete against the rise of the internet stores, long may it last. One thing that works for it is being in Mid Wales, if I travel to West Mids or whatever to a large music shop the costs and time become significant.
Disclaimer - I have no connection other than buying kit over the years.