Setwisohi sums up the issue quite succinctly with the comment "we still have reliable 3rd party sources saying that UKIP are a Populist party against the opinion of one/some editor/s saying they are not." Let's be blunt about this: the 'opinions' of Wiki editors are not worth a fig. Editors are explicitly forbidden to base articles or edits on their opinions. It's the sources which count. While there are relaible third party sources all pointing one way and no sources offering the contrary view, there is no need for debate. And, contrary to what Twilde says, the word populism is not "loaded, subjective and deeply ambiguous". Used by political scientists and commenators it has a very precise meaning. If some readers do not understand it, that is their problem and they need to find out more by reading the works of experts, but it is no reason to do away with it.