John Humphrys asks the questions as four famous faces brave the black chair. Comedian Shappi Khorsandi answers questions on Charlie Chaplin, Scott Mills's Radio 1 sidekick Chris Stark on Scott Mills, The House That ú100k Built presenter Piers Taylor on Bob Dylan and Paralympian gold medallist - and opening ceremony flagbearer - Lee Pearson on British birds.

John Humphrys asks the questions as four famous faces brave the black chair. Mitch Benn answers questions on Peter Cook, BBC News presenter Reeta Chakrabarti on the life and poetry of John Keats, one half of Sam and Mark, Mark Rhodes, on the World Wrestling Federation and double Olympic triathlon gold medallist Alistair Brownlee on the Yorkshire Dales.