No problem, I can find a Proton here, too. It's so cheap (resp.worthless), that it wouldn't make sense to travel to Britain for that - the costs for fuel, Channel/ferry-passage and accomodation (a one-day-tour would be too stressy) would be higher than the value of the car.

If you look ad the ads of mobile.de and autotrader.co.uk, it seems, that the biggest (or only remarkable) European markets of it were Britain and Germany.