"The first Stig, stunt driver Perry McCarthy, lost the job after outing himself in his book Flat Out, Flat Broke, published in 2002.
He was known as The Black Stig and always wore a black suit and helmet before he was "killed off" during the third series in 2003. Collins has since become The White Stig, and wears an all white helmet and suit."
Flat Out, Flat Broke is a great read by the way.
If it is Collins, I hope he writes a book about his experiences with the celebs and the Top Gear folks.