In reply to Bob:
> I think you'd need a quarrying licence if you decided to try and clean them up
A bit harsh, Bob. I was quite keen back in the 1980s to develop some of the crags in this area. Chris Crowder and I abbed several of the lines at Kisdon which were later climbed by Chris Craggs and Colin Binks at around E2/E3 then went into the 1992 NoE guide. The over-riding impression of the place was STEEP - the big walls have some bolts (old by now) - a few lines are described in the book. On the other side of the river are some more crags including a big pinnacle, part of which fell into the river a few years ago!
> The limestone is a different series from that further south and wasn't formed in big thick beds but lots of little ones that aren't bonded that well.
There are several different beds of Yoredale limestones which all have differing characteristics. Some of the rock fits that bill whereas other stuff is much sounder. We also explored several crags nearby some of which would have provided some good trad routes. Chris got out of climbing and put his gardening skills to better use as the Blue Peter gardener (post-Percy Thrower!). We never went back. From another recent thread it sounds like someone has been trying out Hagg Wood as a sport venue?