I would very much recommend THE George a lovely old pub south side of London Bridge in the High Street.Have a look at The George on their website it is one of the oldest pubs in London.
Session 1st Monday in the Month unless there is a Bank Holiday and it is the week after.The music is mainly English,French, Breton,possibly Swedish and whatever the person who is playing decides on.There is the odd rare song but it is mainly a music session.
It will be just down the road from Stockwell about three stops on the tube.See you there?
Al