United Kingdom

Farage himself might win Clacton - his (in)fame could draw voters, and the constituency elected a UKIP MP in 2015 (who had represented it as a Conservative earlier). Lee Anderson, who had been a Tory vice-chairman before he defected to Reform, might hold his seat; there are one or two others, in heavily-Brexit-voting constituencies, where they stand a chance. But they have to take over half the previous Tory vote in a constituency, plus overcome the Labour candidate (who will probably get some of the previous Tory vote too), to win anywhere.

But where they've avoided selecting the nutjobs like this one, they may well come second in many seats.