From the Top Gear website:
You and your guest will meet Team A1 Great Britain, have an exclusive shufti in the paddocks, then get to watch the race from an exclusive vantage point.
And the prizes don't end there. One lucky runner-up will win a seat, and no ordinary seat either - it's a play seat. Before your mind starts racing, it's nothing kinky, but it is a lot of fun and exclusive to http://www.tgrav.com
All you have to do is connect the appropriate wires from the seat to your telly and start your engines. Be a real pretend racer, but with the option to pause for a nice cuppa. http://www.topgear.com/content/winstuff/competitions/a1_gp/