Czechoslovak government-in-exile
During the Second World War, Lockhart became director-general of the Political Warfare Executive, co-ordinating all British propaganda against the Axis powers. He was also for a time the British liaison officer to the Czechoslovak government-in-exile under President Edvard Beneš. After the war, he resumed writing, lecturing and broadcasting and made a weekly BBC Radio broadcast to Czechoslovakia for over ten years.