Thank you Richard.... any other aspects that you could comment on.... ambience, facilities, venues etc?

The type of "folk music" on offer is of course central but from what I've seen (about 20+ performance clubs in the last year + many singarounds & sessions) it is not the only important aspect of having a good experience at a Folk Club. But then I'm pretty eclectic in my tastes, excellence in performance and/or musicianship I would rate as very important though.