Don't know about there being 4 stigs now? Dunno where that comes from?
I do know for certain that Mark Blundell is definately the white Stig (and that comes from someone I know who knows Blundell personally) and Perry McCarthy was the black one but I suppose they may well use alternatives occasionally but not too frequently as the lap comparisons would be inconsistant
And of course Lewis Hamilton isnt the Stig - I cant believe anyone would have thought he was! How the hell would he fit it in?