Thanks for the help. Posted the couple of pictures I had available with me. It is a left-hand drive car.
From the unit number I have from the chassis plate, I would expect it to be an S4, but I read that very few Lotus ones were produced before Caterham stepped-in. Does anyone know what was the last numbered Lotus S4 was?
Also, am I right in assuming that the frame number and chassis number should match?
I'll reach out to John Watson once I have more info, am not with the car at the moment so can't investigate further myself yet. Will keep you posted.