fourth positions. Despite this promising performance, the outbreak of the Second World War prevented any further development of the model. Mitchell-Thomson piloted his Lagonda car to second place in the B.A.R.C. August Meeting at Brooklands, the last ever meeting at the circuit. He set the fifth-fastest lap of the meeting, averaging . He travelled to Belgium for the Liège Grand Prix, scheduled for 27 August 1939 and held at the site of Expo 1939 Liège. He set the third-fastest practice time, but the event was cancelled due to the mobilisation of troops and war began within days. In October 1939, he was reported as being on the Police Reserve. Post-war In 1946, Mitchell-Thomson purchased a Talbot-Lago T26C, serial number 90202. He retired from the 1946 Coupe de la Résistance and made a shared drive with Yves Giraud-Cabantous in the 1947 French Grand Prix but retired with engine issues. He secured a reserve entry for himself in the 1948 British Grand Prix but this did not materialise into a full entry. He entered the Luton Hoo Speed Trials but withdrew from the event. He entered the car to other events with drivers such as Louis Chiron at the wheel. Mitchell-Thomson owned the car until at least 1949 and it was regularly seen in race meetings for many years after his ownership. In 1949, Mitchell-Thomson purchased a Ferrari 166 MM and entered it for the 24 Hours of Le Mans alongside Luigi Chinetti. Recognising that Chinetti was the quicker driver, Mitchell-Thomson allowed him to drive most of the race, taking a single one-hour stint between 4:26 a.m. and 5:38 a.m. once a three-lap lead had been established. The strategy paid off and the duo took the first of nine overall wins for Ferrari in the race. He returned in 1950 partnering Jean Lucas; the pair ran strongly until Lucas crashed out from sixth at around 8 a.m. Mitchell-Thomson became one of the three directors of the HRG Engineering Company in 1947, fulfilling a desire to become involved with a car manufacturing company. He remained in this position until his death in 1963. In 1955, Mitchell-Thomson was reported as serving on the B.A.R.C. Committee. The Sixty Mercedes Mitchell-Thomson owned a 1903 Mercedes 60, once the fastest production car in the world, which he entered to many heritage races. It took part in several editions of the London to Brighton Run, and made an