burl didn't mention The Partisan in Soho, which was a great folk place (and movement place generally) at one time in the early 60s. Martin Winsor, Redd Sullivan, John Baldry, and others. They used to take advantage of the fact that a lot of the public transport stopped early (and still does) to have all nighter folk-sessions lasting in the cellar, lasting until the bleary dawn. Great place to spend the night.