The group is called Led By Donkeys. It's a play on a phrase, "Lions led by donkeys," that was used to describe British infantrymen led by incompetent generals during World War I.
One of the activists, Richard, says pro-Brexit politicians conned Britons into voting to leave the European Union in the landmark 2016 referendum. He says Brexiteers made extravagant claims about how much money the U.K. would get back from the EU and how easy it would be to not only negotiate the U.K.'s departure, but also to cut a new free trade deal with Brussels. Led By Donkeys wants the billboard campaign to encourage citizens to hold public officials accountable.
"They were promised a utopia where the European Union would crumble before our awesome negotiating power and all the problems of Britain would disappear," says Richard, "so we feel we're kind of performing a public information service."