There's really no need to live in a car, there are literally countless "forgotten" houses in the UK. I'd just move into one of those
. You could even get the electricity etc. hooked up and no one would ask any questions so long as the bills were getting paid. Reckon you could probs dodge council tax too.
People are quite unimaginative, if you don't have kids or other dependents, the world is your oyster.