Hi Jerry,
I have just repatriated an S1a from the US earlier this year.
There were no S1 cars available in the UK or europe when I was looking late last year so I had to search wider!
It wasn't cheap to import and it also takes a while but worthwhile as the car is original and only missing a couple of parts of trim.
The company who organised the shipping took care of the import documentation including HMRC/NOVA etc
regards,
Mark