Change your country to US and it's only $5 which will work out at around £3.50. Much better price!
Thanks to Myflumps great suggestion
Red Faction: Guerrilla Download Feature
* Open World Guerrilla Warfare You decide who, when, where and how to battle. Utilize guerrilla tactics, improvised weaponry, and modified vehicles to lead insurgent attacks on EDF targets. Launch attacks based on your own gameplay style, take on missions in any order you choose, or engage in destructive activities to weaken the EDFs grip on Mars.
* Strategic Destruction Use destruction to your tactical advantage, setting ambushes or chain reaction explosions to attack enemy strongholds and permanently modify the game environment. Leverage fully-dynamic physics-based destruction to improvise on the fly: blow holes in a wall or floor to set an ambush or escape, take out a staircase to stop your pursuers, or drive vehicles through blown out walls.
* Evolving & Emergent Gameplay Carve your path through an ever changing landscape as you improvise your combat tactics mixing gameplay styles, vehicles, weapons and explosives to defeat the EDF.
* Epic Sci-Fi Setting Explore the huge, unforgiving Martian landscape, from the desolate mining outpost of Parker to the gleaming EDF capital city of Eos; then tear through the fully destructible open-world environments swarming with EDF forces, Red Faction resistance fighters, and the downtrodden settlers caught in the cross-fire.
* Multiplayer Combat There is no place to hide when you put your guerrilla warfare skills to the test in a variety of highly destructive multiplayer combat modes.
Red Faction: Guerrilla Download Minimum System Requirements
* OS: Windows Vista®/XP
* Processor: 2.0 GHz Dual-Core Processor (Intel Core 2 Duo or AMD Athlon X2)
* Memory: 1 GB RAM 15 GB free hard drive space
* Video Card: 128 MB 3D Video Card w/Shader Model 3.0 Support (Nvidia GeForce 7600/ATI Radeon X1300)
Red Faction: Guerrilla Download Recommended System Requirements
* OS: Windows Vista® for DirectX® 10
* Processor: 3.2 GHz Dual-Core Processor (Intel Core 2 Duo or AMD Athlon X2)
* Memory: 2 GB Available System Memory
* Video Card: 256 MB 3D Video Card w/Shader Model 3.0 Support (Nvidia GeForce 8800/ATI Radeon HD3850)
Red Faction: Guerrilla Download File Size