In reply to Dan Glynn:
Symonds Yat itself hasn't seen a lot of changes, so the latest CC definitive should do you fine. For a few updates to outlying crags (e.g. Staple Edge) refer to the CC Wye Valley Supplement (2012).
The LWV definitive is fine for Shorn Cliff and Wynd Cliff main crags, again, very little change. It's also fine for Wintours, except Woodcroft Quarry which has had a complete rewrite in the Supplement mentioned above. It's also ok for Tintern Quarry, except some more recent harder additions to Red Dust Wall, details in the Supplement (NB climbing at TQ is officially banned).
For Wyndcliffe Quarry refer to the UKC database page, or if you drop me an Email I'll send you a file which is more easily printable and completely up-to-date with the new routes. (There is a LWV sport climbing guidebook in preparation, but it's not yet available).
The best information on Gilwern and Gilwern East is on the SWMC site.