Thanks for directing me to him. Now as the chassis was changed 12 months or so after the car was sold - and with a mileage of max 3.000 miles, I suspect it has been done by the original Lotus dealership - Dick Lovett - that took care of the car until 2003. It was originally sold to a Mr Houghton of Cheltenham. Do anyone has a good contact at Lovett's to recommend, as I'd like to take my chances to ask them if they have some info.
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Exige S1 n°113, 190 HP kit but pretty standard