In reply to Mike Goldthorp: Hi Mikey, i did quite a bit of bouldering there when i lived nearby. the routes in the 'gorge' really need a sustained dry and warm spell - they seep a lot and take quite a bit of drainage so are very likely wet and dirty (oo-er!)
Echoes and Grand Canyon are both ace if you do get a chance to try them.
the bouldering is a much better bet - will stay totally dry in the rain but does seem to hold damp for no reason at times. i guess its to do with the aspect: beside river, generally damp and pretty sheltered.
some good info on North Wales Bouldering's site if you havent seen it. do a search for Pantymwyn here:
http://www.northwalesbouldering.com/search.asp
also, a less up to date topo at back of the Rockfax Clwyd Limestone.
everything i did / tried there was very good:
Firestarter
Panty's Down
Be Ruthless
Mental Extension
Thug Mentality
Under the Bridge
Robert Duvall
enjoy!