David Hatch chairs the radio quiz about radio. This week John Humphrys is pitted against his boss, Rod Liddle , editor of the Todayprogramme, while Stuart Maconie and Terry Wogan valiantly try to get a word in. What's the connection between Angus Deayton and a Geiger counter? And what kind of self-control does James Naughtie lack? ProducerViv Black