As has been said, Davy is an extraordinarily original guitarist - far too original to ever be commercial. There have been a couple of programs about him on UK TV in recent years which I have recorded but, foolishly seem to have taped over. I remember them failing to persuade him to play Angie in one of them. Anyway, if you want to read more about him, he gets a fair amount of coverage in Colin Harper's excellent book, "Bert Jansch and the British Folk and Blues Revival" which is a really good read.
Jacky