In reply to Julian entwistle:
Back in the late 70's and early 80's when my early sales rep area included most of western Northumberland, western Durham and Cumbria, I searched almost all of the North Pennines area looking for potential crags for possible inclusion in the old North of England guide. General consensus back then was that it was too friable to be worthwhile, with loose / dangerous topouts - but then again it was in an era of very traditional ethics. Our group was also developing the excellent Eden Valley routes so were a bit spoiled for choice.