I have no idea at all, even though I have asked the question on many forums. Last I heard from the UK it was 23% customs duty plus vat plus possible NoX charges. But I have never been able to find a site to confirm this. What with the revenue charging , basically what ever they like, without any reference to your bill of sale, and using current market selling price, as they see it would scare me.
I would hate the thought of paying the price of a car, on top of what I already paid, to the revenue. But like I said I dont know for sure either way.
Maybe someone who has bought from the UK since brexit can enlighten us.