In reply to stvey:
Kilnworx is ok, as you say it's not that big, and the route quality is "ok", not a great climbing venue but there's nothing better in Stoke. There are also fairly small venues at Peak Pursuits (Audley) and at the Jubilee sports centre in the middle of Newcastle.
Personally I head for Stockport Awesome Walls if I'm making a day of it, Kilnworx if not, and the Stoke AW if I want bouldering. I'm told that AW would develop a large roped wall in Stoke if they could find a suitable building; they looked for one and then went for the bouldering-only venue.