Journalist Peter Geoghegan describes the many ways in which private money is corrupting democratic politics, encouraging chaos and fuelling public cynicism.

In an extended interview with the BBC's Ed Butler, the Irish author and broadcaster explains a Brexit campaign advert that he happened to come across in a local newspaper while visiting the city of Sunderland in the north of England led him to investigate where the money funding the Leave campaign was coming from. It led him to explore how business and political interests - often from foreign countries - were able over decades to shift the political discourse in Western liberal democracies in their favour.

(Picture: US flag made out of one dollar bills; Credit: Matt Anderson Photography/Getty Images)