The St George's one is interesting. In my caving guise, I had a look round on Christmas Day about 5 years ago looking for clues as to the fabled St George's Cave mentioned in Tony Oldham's book. There was indeed an entry to the far north, with a blowhole type exit up to the bench above. Rather wimpily, and due to the glutinous clay, and probably due to the proximity of fragments of det cable I did not enter for a viewing.Chances are it was an abandoned fragment, and not St George's Cave itself which I assume was a resurgence and is described in TO's book as 'Lost'. Now though, maybe a return visit is due.
Robin