Richard Maibaum episode "The Medal" for "Combat!" (1963) then wrote "From Russia with Love" (1963), sharing credit with Harwood. Maibaum worked on "Goldfinger" (1964), on which Paul Dehn also did work. He was one of several writers on "Thunderball" (1965). "You Only Live Twice" (1967) was the first Bond film on which Maibaum was not credited as a writer, the producers using Roald Dahl. Albert Broccoli wanted to produce a non-Bond movie, "Chitty Chitty Bang Bang" (1968) and Maibaum did some work on the script. Maibum received sole script credit for "On Her Majesty's Secret Service" (1969), starring George Lazenby. He did
Chitty Bang Bang was never as successful as its predecessor, but took part in several road races, including a Sahara Desert expedition in 1922. It later became the property of the Crawford Auto-Aviation Museum in Cleveland, Ohio. It is now part of the private collection of Bob Bahre at his home in Paris Hill, Maine (the former mansion of Hannibal Hamlin, Lincoln's first Vice-President). Chitty 3 was based on a modified Mercedes chassis with a Mercedes single-overhead-camshaft six-cylinder aero engine, tuned to produce . The car recorded a lap of Brooklands at . Louis Zborowski later used it as his personal transport, and