Martin Williams was a First Secretary at the British Embassy in Iran when militants invaded the US Embassy in November 1979, taking 52 hostages and sparking an international crisis that lasted 14 months. In his Oscar-winning film Argo, director and star Ben Affleck tells how six American diplomats hid in the Canadian Ambassador’s house in Tehran until the CIA arranged an ingenious escape plan – after they had been callously turned away when they sought shelter at the British Embassy. Here Mr Williams, 71, who later was High Commissioner to Zimbabwe and New Zealand, says this is a gross misrepresentation...