(BTW, unlike for PiS, I don't know much about UKIP -- other than being nutty Eurosceptics and against immigration.) *Lunatic*, n. One whose delusions are out of fashion.
They hoover up the anti-EU vote in EU elections, but I'd guess most of their supporters will vote Tory in the coming epic struggle for the warm beating heart of England.
Er, I mean Britain, obviously.