Martin Simpson . . Going from your original list, try his "Live" (UK recording) or his new Topic release (of mainly English trad. songs) which I've yet to purchase . . For a more Blues bias - it has to be "Smoke and Mirrors".Martin Carthy (with Swarbrick): the CD of Byker Hill - old, but still possibly his finest album.
Tomas Lynch: The Crux of the Catalogue: The finest ever Irish Folk recording.
Nancy Kerr and James Fagin: The very best of the UK's "young folkies".
Roy Bailey
No, I wouldn't say Ms Crow was even remotely Folk (nor, really that Ms Shocked was) - well, not in the more common UK usages of the term. Not that it matters a fig either way!
G.