Who is the Stig?

A mystery that has plagued me for a while is still an enigma- still, there are many hypotheses. Likely suspects include Russ Swift, Damon Hill and Tiff Needel, but super sleuth vcjester posted his/her theory that it is Ben Collins on the Top Gear forums. Ben Collins is listed in Richard Hammond's accident report as having been used as a motor sport expert by Top Gear, a role he had not occupied before- i.e. he has previously worked for Top Gear. Also, apparently the height of the Stig, in comparison to the height of Lewis Hamilton, roughly fits with Mr. Collins. Intriguing!