Auto Trader has an interview with the totally awesome stunt driver Russ Swift. In it, he responds to a question about if he’s the Stig:

Simon Britchford from Birmingham asks ‘Are you the Stig from Top Gear?’

“(Pause) No comment. What we… (laughs) what Top Gear like about the Stig is the fact that nobody knows who it is. A lot of people think it’s Damon Hill.
It is not one person.”