Is It Dishonourable to Publish a Political Diary?

Michael Portillo and his guests discuss whether it is fair for politicians to profit from their years in power by betraying the confidences of their colleagues. Is the modern diarist motivated by money, fame or revenge, rather than the public interest? Or do political diaries serve an important purpose by throwing light on the inner workings of government? Guests include Gyles Brandreth, Oona King, Chris Mullin MP and Lord Hattersley.