Is Britain a corrupt country?

Boris Johnson today has said that Britain is not a corrupt country, but what does it mean that he felt the need to say that? On today's Coffee House Shots, Fraser Nelson points out that there is no clear firebreak to the present string of sleaze stories; and James Forsyth estimates that around a quarter of MPs have some kind of external earnings. So what more will come out of the woodworks? Cindy Yu talks to Fraser, James and Katy Balls.