You are entering an illegal street race organization as a rookie. This organization conducts illegal races on the M25 and in London and Oxford. In this hierarchic organization you'll have to start in the small league. When you're good enough, they will let you enter the "Luxury sports car" league but at the end, you'll be trying to reach the ultimate league: the "GT Racer" League. During the leagues, you'll be trying to go faster and faster through buying extra's for your car to tune it up.
3D accelerator is required, but software mode will be available in the final version.