Thanks for this. The 'new' partial VIN I quoted above is indeed one of the identical pair of stampings on the bulkhead. The dashtop VIN is as per previous older posts.
There's no sign of oddball welding anywhere else on the structure, so my surmise is that this is one complete coupe chassis with a possible dash change - for whatever reason (and as you say - could be a can of worms). The car certainly left the USA in 1993 and was sold on in the UK in 1994.
Anyway, thanks for your speedy reply. I live in West London about 6 miles from Hammersmith/Shepherds Bush. Great place and very lively socially - I organise a monthly London race-drivers meeting at a pub less than a mile from there. What business were you in over here ?