In 1936, Scott took over Sir Alan Cobham's National Air Displays Ltd and for one season operated C.W.A. Scott Flying Display Ltd. In September that year, he won another air race; flying a Percival Vega Gull, he and Giles Guthrie won the Schlesinger Air Race from Portsmouth to Johannesburg, South Africa, again winning the £10,000 prize money. Before the race, Scott married his second wife, Greta Bremna, but they divorced in 1940. With the onset of World War II Scott served for a time as an Air Raid Precautions (ARP) civil defence ambulance driver then he joined the Royal Naval Volunteer Reserve (RNVR) as a lieutenant, and took part in the Dakar landing. He also spent a period as an Atlantic ferry pilot and was stationed with de Havilland Canada as a test pilot, testing newly built de Havilland Mosquitos and training pilots to fly them. Following the war, and after becoming estranged from his third wife, Scott took a post at the United Nations Relief and Rehabilitation Administration (UNRRA) headquarters in Germany. On 15 April 1946, while in a state of depression, he fatally wounded himself with a gunshot, using his military-issue revolver.