I nominate Bothy Folk Club in Southport, but then I would, as I do the website.
We must be doing something right as we have been going for 42yrs. Unfortunately we are having a change of venue forced upon us, (3rd in 41yrs). Worry not we have found a really good new venue for the new year. ( Had a great night with 'Rattle on the Stovepipe' last sun)
Cheers
Les