I always go for Premier Travel Inns wherever I stay, just because you know you generally get the same standard of room, and if you're not happy you can get a refund.

Try some of these:
http://www.activehotels.com/wl/servl...960&trkref=LTK

I strongly recommend that you do NOT stay at the Ramada Jarvis Piccadilly Hotel though, it's absolutely filthy