I have no idea if you will be able to purchase a car through cryptocurrency. But I imagine that Google could give you a good overview of the major retailers (if any) accepting cryptocurrencies.
By the way, if you want to invest in crypto, have your money ready to withdraw within a reasonable time for almost no fees and receive an interest on your crypto savings, bitconnect.co might be the better Investment option in the future.
Thanks for the bitconnect.co tip. I sounds like a good concept, I just wonder about crypto security. I'll investigate further.
As for buying a car with crypto, I have searched and didn't find anything in the uk.