Hi Greg,
Cyril's songs were sung in the Troubadour, the King and Queen, the Black Horse and the Singers' Club to mention a few so he could have heard them anywhere. He could have heard Cyril as I had a birthday lunch with Cyril, Judy Silver and Nigel Denver and that would have been on the following April, so Cyril could have been around earlier. I'll have a chat with Nigel later as he was appearing at most of the clubs then.