It in the simulation section. Its the full game but you only get 60 minutes then you pay �12.99 to get unlock code.
Or you can get full version for �4.99 at www.play.com
I know you said you wanted it free but �4.99 is not much. They are doing 3 for �10 on this sort of game at the moment.... theme park world, worms&worms armageddon, hotel giant etc. Thats �3.33 per game so worth it :-)