I'm a Top Gear fan, and I gotta come down on the side of the BBC on this one.
I mean I'm all for freedom of speech and expression. But I'm also sure that he (Stig/Ben Collins) signed a contract with a confidentiality / anonymity / don't-reveal-who you-are clause... ... which he has now broken. Harper Collins and Ben Collins say it's all about "freedom of speech"

it's actually all about making money by breaking a contract, and creating a controversy to sell more books.
Many already knew (or guessed) that Collins was the Stig due to documents that came out in the investigation of Richard Hammond's rocket car crash, and financial records from Collins' own company. But for him to come out in this manner, blatantly breaking a legal contract for nothing but fame and money, just reeks of greed and lack of integrity to me. I don't know much about him, but he gets a thumbs down on this for me.
Why not retire from the Stig job quietly, then publish his biography in 10 years by which time Top Gear will probably be history and the BBC wouldn't give a hoot?? Oh wait I know... ... cause he can sell more books now by virtue of the controversy he's created.
I can't believe that the BBC didn't win this one... I mean come on!! The guy knew what he was getting into when he signed on for the job, and he knew that anonymity was the biggest part of that.