In reply to Removed UserJeremy Ashcroft: I've been to the Knotts and they are a bit limited. There is a "real" crag about a mile along the ridge in the opposite direction - Cold Stones Crag which is in the Lancs guide (and on UKC). Here is some stuff that Tom Phillips and friends developed a bit ago
http://www.w-o-w.com/climbing/yorkshire-bouldering/Birchow_Rocks_Topo.html I've walked past it and it seems pleasant enough although I haven't put hand to rock there. I recall there is a small grit quarry close to Giggleswick School (the big domed building - can't miss it) I was shown years ago that was quite entertaining and I've never seen that in print anywhere. Closer to Lancaster there is the mighty Baines Crag (GR SD 543617). Lots of problems if you use your imagination and the small crag near the big carpark has some neat little problems around the obvious arete. Happy hunting! Karl