The Book of the Movie of the Book: Chitty Chitty Bang Bang, The Story of the Film

Chitty Chitty Bang Bang, The Story of the Film (1968)
By John Burke (author of many novelizations and contributor to British TV horror anthologies)

Based on the film Chitty-Chitty-Bang-Bang (1968)
Screenplay by Roald Dahl (of suspense short story anthology and I guess some children's book fame), and Ken Hughes
Based on the novel Chitty-Chitty-Bang-Bang: The Magical Car (1964)
By Ian Fleming (famous at the time, I guess)

THE STORY OF THE FILM, based on the screenplay by Roald Dahl and Ken Hughes from IAN FLEMING'S original stories.