In reply to alanlgm: The best routes up to 6a+ are in this ticklist
http://www.ukclimbing.com/logbook/set.php?id=519
They are fairly well spread out along the crag, but a good day can be had by walking down to the Main Cliff then working your way back along the escarpment ticking the easier lines en route. Useful to have the Lower Wye 2007 and the 2012 supplement as there has been a fair amount of retro bolting in recent years.
Slightly harder routes that are worthwhile include Lotus Wing 6b and the already mentioned Heady Days 6b+ - surely one of the most spectacular routes of this grade in the UK, don't miss it!