This is like a treasure hunt; one clue leads to the next.

Did the British Folk Song and Dance Ensemble exist? Were MacColl and Lloyd involved with it? Was Michael Gorman working with them in any way?

This is the link I should have given for Henry Cowell. I didn't realise which part of the site I was looking at when I harvested the address. Sounds like a man who would know what he was talking about.