Here's an odd coincidence: I see from the United Manchester web site that Mike Harding is the author of "A Little Book of the Green Man" and "A Little Book of Misericords" both of which I bought last year in York, mainly for their photographs. I didn't know the author was a folksinger!
I searched for "Jinny Bobbin" on the Internet and failed to find it. Harding sounds like an interesting guy, though, and I hope someone succeeds in posting his work here. Anyone whose "roots and influences" are Flanders & Swann and Stanley Holloway certainly sounds promising.