Apologies if I mis-read your comments. Easily done.

Just to clarify where my knowledge comes from.

I attended the Ballads and Blues at The Princess Louise each week from around 1956/57, can't remember the exact date.I took guitar lessons from Peggy Seeger until she had to skip off briefly to France in 1959.

Malcolm Nixon asked me to take on the booking and running of the Ballads and Blues from September 1961 at the Seven Down (Eric Winter's SING magazine was probably printed before he knew of the new venue) which I did until we closed down in May 1965 at The King of Corsica in Berwick Street as stated above. NOT The Black Horse. After we left the Black Horse and before the King of Corsica we were at The Porcupine just off Charing Cross Road.

Other venues post Princess Louise included The Coram Hotel in Fitzrovia and The Horse Shoes next to The Dominion Theatre in Tottenham Court Road.