The first game on PC (which is a good version of the game) is only £4.99, which is cheaper than everywhere currently.
Windows XP SP2 or Vista or Windows 7
Intel Pentium 4 2.8GHz or equivalent
1GB RAM for XP, 2GB for Vista
7.2GB hard drive space
256MB video card w/ SM 3.0 (nVidia GeForce 6800/ ATI Radeon X1600 Pro) (Shader 3.0 support)
DirectX 9.0c sound card
NOTE: At the time of posting this (14:22, 23/02/2011), there is stock. GAME have a habit of running out of stock after two orders.