The singing session at the Kelham Island Tavern in Sheffield (4th Sunday of every month) is on the flat and the disabled loo even opens on to the (non-smoking) room that the session happens in. It's not quite a folk club mind you - less formal than that - but ideal for anybody who likes a good sing cos it basically consists of a whole evening of unaccompanied chorus type songs that everybody can join in with. (Plus the pub is really friendly and has a range of about 9 real ales at any point in time)