The Stig's true identity is never revealed on the show, and in order to maintain the secrecy, all shots show him wearing full racing overalls and matching helmet. All that can be seen from the gap between his helmet and jumpsuit is that he is a white male with dark hair. It is also known that he wears size 10 racing boots as discovered by the Sunday Times when the Driving section wrote an article about the show.[8] During an interview The Stig spoke to a Dutch reporter on camera, revealing a hint of a British accent.[9]
The identity of the first Stig was revealed to be Perry McCarthy when his book Flat Out, Flat Broke was published in 2003. McCarthy is a former Formula 1 driver and test driver for the Benetton, Arrows and Williams teams, and also tested for BMW F1.[2]
The identity of the new Stig has not been officially revealed. In a Winter Olympics special episode of Top Gear, the Stig was shown doing a ski jump using a snowmobile. According to the Swedish tabloid newspaper Aftonbladet, the driver performing the ski jump stunt was Dan Lang, a Swedish snowmobile cross driver.[10] In January 2006, a Daily Express article reported that Julian Bailey was secretly the Stig.[11] In January 2007, Russ Swift, a stunt driver that has appeared on the show a number of times, said in an interview that the Stig is not played by just one person.[12]
It can be confirmed categorically that the current (August 2007) 'main' Stig is Ben Collins, but there are at least two other 'minor' Stigs who have been seen carrying out various drives. Ben was seen repeatedly changing into the Stig suit at the Silverstone 24r Britcar race recently and then seen getting into the Top Gear BMW.
Taken from
http://en.wikipedia.org/wiki/The_Stig