In reply to Mike Weatherill:
This is without doubt the best selective guide for the occasional visitor:
http://www.wired-guides.com/#guides/pembroke
Many more routes and crags than the Rockfax and a fraction of the price of the full set of 5 comprehensive guides, although those document a little more bouldering. I'd recommend
No match for crag id:3959 for a spot of DWS, but keep an eye out for Jellyfish, there were loads in the water there when I visited, fortunately I stayed dry!