@Hairs I was referring to Stig (ie. Ben Collins) being the development and test driver for Ascari. He actually worked for the company in developing the car, so when it came time for the A10 to appear on the show, The Stig was already very farmiliar with it since he had a role in developing and testing the car. Since he was the test driver, I would assume that the A10 would have been tuned, setup and developed to suit the driving style of Collins (ie. The Stig).
If you look at Collins’ Wikipedia page, you can see the various roles he has performed, and being employed by Ascari is mentioned. He has also appeared as his real self on Top Gear numerous times, and in the report for Hammonds accident, it mentions that Collins was a ‘consultant’ to him prior to him taking off and crashing the rocket car (that would also suggest that he is The Stig).