In reply to PebblePusher:
Some strange suggestions on this thread, much of Wilton (Prow excepted) will most likely be disgusting as will Dovestones. Standing Stones if OK if it is warm and windless, but it is high and draughty. Alderman and Rob's Rocks may be OK though they are pretty limited.
Hobson Moor, Castle Naze, New Mills (steep) and Denham are probably your best bets. Pex Hill for bouldering and Widgather are two other possibles.
Chris