The Green Party's attempt to show how they are the only 'true' alternative to the establishment parties, those being the Conservatives, Liberal Democrats, Labour and UKIP.
https://www.newschoolers.com/videos/watch/765913/Green-Party-Assemble-Leaders-Boy-Band-In-Hilarious-Advert
Article - http://www.telegraph.co.uk/news/politics/green-party/11522432/Green-Party-releases-boyband-video.html