As Don says the Bedford has a very mixed session in the main bar: there was one afternoon a couple of years ago when it turned into "Concertinas Rule OK", and most of the rest voted with their feet! After many years of going to the Bedford I eventually discovered the late night "inner sanctum" where the serious singers go! And there's the small dining room where the professional players usually end up.
Smokers seem to head for the Swan as there's the outdoor bit at the back, albeit under a canopy, where they make up for the smoking ban elsewhere!