Pat's car is a Triumph Roadster.
Chris's car is a 1935-6 Ford Model 48/68 Coupe.
The aircraft Chalky is working on when Chris and Pat come to meet him is a Vickers Viking 1B operated by British European Airways: dubbed 'Volatile', registered G-AJDI, first flown 1949, and in 1956 converted for use by the Argentine Air Force. The BEA aircraft next to it is Viking 1B 'Viscount', registered G-AJBV, first flown 1948, and in 1953 converted for use by Iraqi Airways.