You learn something every day (or week in my case).
What I hadn't thought enough about - and have no previous knowledge of - is the fact that I need to "import" the car before I can register it and more importantly drive it!
It's now officially imported and awaiting the registration application form DVLA which takes 7 to 10 days to arrive, then 4 - 6 weeks following that to get a V5, UK registration and road tax
I'm sure everyone else nows that it's illegal for a UK citizen to drive a non UK reg car on the UK roads