I think it's a mistake to use "fascist" loosely. Having far right beliefs, and hostility to immigration doesn’t really equate to fascist ideology, it's essentially mainstream Toryism.

And Farage is far too crafty and manipulative a politician for "nutter" to really fit. If he'd been a nutter he'd have been a lot less dangerous than he has been. It very much fitted into his game plan to be seen as a joke.