Stephen Lewis (17 December 1926 – 12 August 2015), credited early in his career as Stephen Cato, was an English actor, comedian, director, screenwriter, and playwright. He is best known for his roles as Inspector Cyril "Blakey" Blake in the LWT sitcom and film versions of On the Buses, appearing for the length of the series, (along with Bob Grant and Anna Karen), Clem "Smiler" Hemmingway in Last of the Summer Wine, and Harry Lambert in BBC Television's Oh, Doctor Beeching!.