win in the Silverstone International Trophy and finished sixth in his class in the Prescott Hillclimb. In 1950 he joined Aston Martin and gave support to three drivers: Reg Parnell, Peter Collins and Roy Salvadori. Thompson's first race for Aston Martin was a one-hour race held at Silverstone where he finished fourth in his class and 14th overall. He also took part in the 1950 24 Heures du Mans sharing an Aston Martin DB2 with John Gordon but was forced out after nine laps due to engine failure. Thompson also raced with HRG and secured a class win finishing second overall at Blandford, third in a Goodwood Handicap and clinched a class win at the Cambridge University Sprint at Bedwell Hey. In the same year Thompson made his debut in Formula Three driving a Cooper-Vincent at Castle Combe where he retired. In 1951 Thompson competed prominently in open-wheel racing. He competed in the Goodwood Lavant Cup in a Cooper finishing fifth and finished in the same position in a Bugatti Type 51 in a Boreham Libre event. He later competed in an ERA/Delage and Delahaye and other Libre races, and took part in sports car events with an Aston Martin DB2 in the RAC Tourist Trophy where he finished third in his class and eighth overall. For the works team, Thompson shared a DB2 with Lance Macklin in the Les 24 Heures du Mans where the pair clinched victory in the 3-litre class and finished third overall. In 1952 Thompson took part in his third Les 24 Heures du Mans driving an Aston Martin DB3 alongside Parnell but retired from transmission problems. The pair suffered a further retirement from the Goodwood Nine Hours when, during the race, the car being driven by Thompson entered the pitlane with smoke coming out of the car and Parnell was not prepared to take over the seat. Parnell grabbed Thompson by the arm and dragged him out before the car caught fire. Throughout the year he drove a DB2 entered by Peter Walker, clinching two victories in handicap events at Goodwood and one at Snetterton with a seventh and eighth at the same circuit. He later took third in class at the CUAC Bottisham Sprint. Thompson took second, seventh and tenth in races at Snetterton, third at Boreham and Castle Combe driving an ERA/Delage and fifth in a private ERA at the British Grand