Probably wouldn't buy this myself and the price will probably drop fairly quickly on this one, but it's the best price for anyone interested
Next cheapest is Base.com for £28.95
From the product page:
Constant sensation of ultimate speed is the players companion throughout the game. Lightning-fast reflexes and tactic skills are what stands between victory and defeat. Breakneck rides on near vertical mountainsides with up to 70-degree slopes - feel your heart pumping!
Extreme track design with breathtaking vistas - learning the inside-outs of their topography will be an advantage in the race for #1. Steer your vehicle mid air allowing for full control over your ride. Shortening or lengthening your jumps, changing angles can make or break your lap time.
The online racing community of nail'd opens the road to fame and fortune, putting you in the driver's seat to be the best in the world. With global ladders and tournaments its a global racing circus in your home! Assemble your own vehicles from a wide selection of parts and components. Adjust their parameters to best suit your playing style and personalize the looks, making it unique and truly your own.
Different classes compete simultaneously on the same track
Multiplayer - up to 12 players
Extensive Online options - leaderboards, achievements
Own soundtrack by popular US rock-musicians
16 unforgettable tracks in 4 exciting locations