Overview: Christmas University Challenge is a series of matches featuring teams of distinguished graduates from ten universities. It is the penultimate first round match of the series, with graduates from both the University of Warwick and the University of Sheffield fighting it out in a bid to get through to the semi-finals. On the Warwick team, writer and broadcaster Christian Wolmar and on the Sheffield team, head of Radio One George Ergatoudis. Jeremy Paxman asks the questions.