In reply to mauuddd05: Climb Rochdale is very good but you need to get the train from Victoria Station not picadilly. From there you can also go to Boulder UK in Blackburn, great bouldering but takes ages to get to.
From Picadilly/Oxford Road you can get virtually to the door of Salford Uni climbing wall (Salford Crescent station) which is ok but not as good as Rochdale (however the membership is cheap there, they have a bouldering comp on at the moment, and its easy to get to). Also you can get to Broughton Wall by getting off the train there and a bit of a walk (10-15mins), they have excellent bouldering and its cheap, only problem is getting from the train station to the wall involved walking through a pretty rough area so be careful.
You can also get a train to Warrington from picc/oxford rd where NW Face has loads of leading/top ropes and some bouldering, 5 mins walk from Warrington central station. Theres also Rope Race in Marple, Stockport but i havent been there.
Some websites to help you:
www.climbukltd.com -rochdale
www.boulderuk.com -blackburn
www.broughtonwall.co.uk -broughton
I think thats right, they should be on the search thing anyway.
Hope that helps.