I think the reason why gag candidates are so common in UK elections is thus:
1. Relative ease of running for parliament - you just need 10 signatures of residents in the constituency + £500. Which obviously is not a small sum of money but it's low enough that people are willing to blow it on a publicity stunt or a protest.
2. First past the post system + being a small country means that every general election is made up of 650 local elections, typically 1-2 towns worth of people.
3. Deep seated irreverence for politics.
the way i see it the benefit of the gag candidate is threefold:
to provide a kind of 'none of the above' option on the ballot paper, as a candidate with no actual policies or stances. unlike spoiling your ballot votes for gag candidates are real votes; there will be a publicly available figure of how many people chose the man with the bin on his head over any of the actual politicians.
to act as an ongoing reminder that anyone can run for parliament on any platform. and that's beautiful!
to act as a reminder to politicians not to get too big for their britches. yes, you might be the prime minister, but on election night? you share the stage with the man with a bin on his head. :)






















