re: Shirley Collins singing it. I did give a reference and I do have a copy of the tape. Only thing is I've got hundreds of old tapes, badly catalogued, and I can't find it at present. When I do, I'll post details. All I know at present is that it will be from UK Radio 2's "Folkweave" sometime in 1976 or 1977 and probably live at a folk club or a festival.
Shirley Collins is not terribly well represented on the web, and I can't find anything in any of her discographies. Surely, though a clear reference to something taped by someone who owns it is a reasonable reference. Probably far better than much of the inaccurate rubbish you get on most web sites, anyhow.