I was just doing some reading about Gawain and the Green Knight and found a site on t'internet which gives some possibilities for the locations mentioned. Now I was quite excited by this as I've often thought to myself that I knew where the Green Chapel might be and the person who owns this site has chosen the same place - a very, very weird cave near Wetton Mill in the Manifold Valley.
Anyway, I though it might be of interest so here it is:
http://www.it
haca.edu/faculty/twomey/travels/sggk_frameset.htm (hoping link works, something's changed???)
I remember one spring day about ten years back me and my mate were having a nose around the Manifold Valley, Dovedale and Thor's Cave (mentioned on that site) and we saw this cave from the road and we were spooked by it but couldn't work out how to get up to it - the rivers were in full flood and not long before we'd narrowly missed driving into a ford over the River Manifold that had turned into a raging torrent. Might be a good expedition one day?