Who penned the S1? (Elise Motorsport)Was it Julian Thompson or Russell Carr?

The Oily Bits S1 Specific Topics
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…Or someone else?
There seems to be plenty of design history on the S1 Elise, but nothing seems to be mentioned on how the Elise Motorsport (Exige) came about or was developed?

Any facts floating about?

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Russell Carr and Steve Crijns I believe.