You need to use code PREORDER20 to get this stunning deal for this game. Xbox360/PS3 versions can also be had for £29.35 (or £27.59 with quidco).
Quidco also give 6% cashback on all sales from bee.com meaning you can potentially have these for:
PC £17.29 (Quidco worth £1.10)
XBOX360/PS3 £27.59 (Quidco worth £1.76)
Brilliant deal I think, even for the console versions, but especially the PC version.
The deal links to the PC version since that's the main topic, but here's the console links too.
This only applies to pre-order, but I doubt there will be a better deal than this, so order before the 24th June 2011.