On 7 November, 1974, nanny Sandra Rivett was found murdered in the affluent London neighbourhood of Belgravia. The prime suspect? The father of her young charges, Lord Lucan. But before the aristocrat could be questioned, he vanished, sparking one of the greatest cause célèbres of the 20th century. Author Laura Thompson tells Ellie Cawthorne more about the case, and what it can reveal about simmering class tensions in Britain at the time. (Ad) Laura Thompson is the author of A Different Class of Murder: The Story of Lord Lucan (Head of Zeus, 2014). Buy it now from Amazon: https://www.amazon.co.uk/Different-Class-Murder-Laura-Thompson/dp/1781855366/?tag=bbchistory045-21&ascsubtag=historyextra-social-histboty. Kate Morgan chronicles the legal history of murder, discussing the cases that shaped UK murder laws: https://link.chtbl.com/kNn9jPWH. The HistoryExtra podcast is produced by the team behind BBC History Magazine. Learn more about your ad choices. Visit podcastchoices.com/adchoices