Arthur Melbourne-Cooper Derby" of 1913 at Epsom, in which suffragette Emily Davison can be seen being trampled to death by the King's racing horse. It was filmed by Cooper with his camera at the finish and his brother Hubert at Tattenham Corner. Both companies were wound up at the outbreak of the First World War when Andrew Heron reported himself for active service. Cooper became munition inspector in Luton, while the family lived nearby in Dunstable. After the First World War, Cooper and his family moved to Blackpool where he became manager of Animads, a subdivision of Langford's Advertising Agency Ltd. He
Grundy (horse) half from the finish and pulled clear to win by three lengths from the filly Nobiliary with Hunza Dancer in third. Three weeks after his win at Epsom, Grundy was sent to the Curragh for the Irish Derby for which he started 9/10 favourite. Despite trailing in seventh place coming into the home straight, he broke away from the field in the closing stages and won decisively by two lengths from King Pellinore and Anne's Pretender. In The Observer's list of the ""10 greatest horse races of all time"," the match between Grundy and Bustino in the King George VI