Who is the Stig?

As in the second, and current white suited Stig?

A friend* has recently pointed to this report by the HSE into Hammond's crash.

The report lists one Ben Collins as someone, "who worked closely with Top Gear as a high performance driver and consultant".

I wonder....

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*Kudos to "Gorgeous" George Morley

It has been speculated that

It has been speculated that Ben Collins is the Stig for a number of years, as demonstrated by this thread on Pistonheads.

Now can anyone solve the mystery of who African Stig is?