Just to add a piece of trivia, in the late 60's there was a multi musical event at Essex University, I can't remember all the bands but Incredible string band, Stefan Grossman and Anne Briggs were there.
I don't remember how Stefan, Anne and I got to be in the same room, but I listened to what may have been the only performance these two gave. They were only trying stuff out and don't think it ever came to anything, like I said just a piece of trivia.