In reply to Paul Phillips - UKC and UKH:
I'd second the recommendation for the Rockfax guide. I replaced my very old western grit guide (circa 1989) with the western grit Rockfax and love it. Great layout, colour coded grade bands, superb photos of the routes and crags.
My mate has the eastern one and it's equally as good.
That said, I've not used the BMC guide so cannot compare but the Rockfax was money well spent. The grade creep since the '89 guide means I'm climbing harder too