where the first item listed is "Where can I buy a mountain Dulcimer in the UK – i.e. their list of dealers/makers.
I don't know anything about this club, and can't make much of an evaluation of their list from here in Kansas, but people in your own area are likely to be more knowledgeable than us 'furiners." If you don't find one listed, perhaps contacting the "club" would get info from someone with local knowledge.