Just taking a little break and read the last few posts; this forum at its best. I agree about George writing a book; am sure he has collaborated on quite a few.
Prehistoric Rock Art in Britain by Stan Beckensall has some of his photos (as well as many by Brian Kerr) - now for sale at Oxbow Books reduced from £18.99 to £6.95. A great bargain.
Lots of other rock art titles too:
