The Liquidator (1965)

Colonel Mostyn is the chief of a section of the British Security Services when they are embarrassed by the number of spies and defections. The Chief tells him to do something about it so he hires Boys Oaks as Agent L - The Liquidator, to assassinate people about to cause trouble. Although Boys likes the cars and the girls that his new position attracts he's not any good at it. He's also got a phobia about flying that makes jetting off to exotic places a bit of an embarrassment.