Don't know whwre BruceL is from but it occurs to me that my old friend Bob Thomson did more work than anybody with Harry Cox - from recording him to helping sort out his broadside collection
Bob became head of the English department at Gainsville Uni Florida way back - I'm not sure where he is now - well worth asking round

Also if Mike Yates hasn't met either of these singers, they are among the few he hasn't worked with
He's sure to spot this thread -   
Jim Carroll