The fourth episode in Series 10 of the entertaining BBC Radio 4 tag talk show where this week's guest is next week's interviewer. In this programme, Ruby Wax takes the microphone to interview voice of 'The Simpsons', face of Derek Smalls and political satirist Harry Shearer. Ruby asks Harry to delve into some of his Simpsons characters, where he found the inspiration for Derek Smalls in 'Spinal Tap' and who his favourite political target has been over the years.
