 The used car salesmen Dunstan and Dudley (Dennis Price and Peter  Jones) were based on characters from the BBC radio comedy series "In  All Directions" broadcast during the 1950s. The radio characters  were known as Morry and Dud and were played by Peter Ustinov and  Peter Jones who also wrote the scripts together with scriptwriters  Frank Muir and Denis Norden. Their catch phrase "run for it!" was  reprised in the film.