During the Second World War, Winston Churchill visited the USA in order to help gain the support from the American president. However, there was also something else troubling him. In the USA was also Churchill’s former lover Lady Doris Castlerosse. She was stuck in the USA and wanted to return to Britain, but the PM was worried that his enemies could use this affair as a way of undermining both his career and the war effort. This programme looks at how Churchill dealt with the issue. Churchill’s Secret Affair is on Channel 4 at 20.00.