Mentioned on hotukdeals already, but Ubisoft are doing a promotion from today until Sunday where you can download a select PC game for £1. Games are:

Thursday: Hawx 2
Friday: From Dust
Saturday: Silent Hunters 5
Sunday: Driver San Francisco

http://ubi.com/UK/

Believe the games have to be downloaded with 30 days of purchase.

Other games are also on promotion on the same days, see following thread for more details:

http://www.hotukdeals.com/deals/pc-u...from-1-1288284