Hi Doc,
Its not a problem having and using a classic American car here in the UK as our vehicle licencing department (DVLA) is federal, one official body deals with every vehicle related regulation and licencing for the whole of the UK.
Enthusiasts ship cars from America & South Africa to the UK every day of the year and as long as the ownership papers and correct import documents are in place its a fairly straight-forward process. I was going to bring a P15 over from Florida and decided to get an international shipper to deal with it, sorted out a door to door contract and between the moving the car to Jacksonville from St Petersburg, Florida, onto a ship, across the Atlantic and then from Tilbury Docks near London on a flat-bed transporter to my driveway worked out about $2000 and that included additional import taxes when it arrived on British shores and federal tax (VAT at 5%). There's a big classic American hobby in Scotland (and the rest of the UK), so there's a reasonable amount of help if I need it. Spares I hope won't be an issue, for the Chevy everything was a available with a telephone call and a credit card, Plymouth spares I've still to find out about, but I think they're thinner on the ground than Tri-Chevy parts, time will tell.