EnglishFolkfan,

I was interested in your mention of Robin Hall and Jimmy Mcgregor.
You're right, they used to appear on the 'Tonight' programme presented by Cliff Michelmore ('the next Tonight will be tomorrow night...') and enjoyed by all.
Most people of my generation will cite The Spinners and their ilk as their first introduction to folk music, but RH and JM were there first.
Also on the same programme was Cy Grant, performing topical calypsos, an art form taken up a little later by Lance Percival.