You think UKIP is fascist? Wikipedia defines that with the phrase "...dictatorial power, forcible suppression of opposition...". Many powerful politically inclined groups are forcibly silencing their opponents these days, but UKIP is not among them.
You left out the first part of that sentence, which reads: “Fascism (/ˈfæʃɪzəm/) is a form of radical, right-wing, authoritarian ultranationalism...”
On political topics, Wikipedia is extremely untrustworthy. Paid political workers are writing things like that. Lots of definitions have been changing over the past decade or two. Fascism and also Nazi would not normally have included "right-wing" in the definition in the prior century.