Let the People Sing

G.H. Mulcaster as Inspector Raymond Lovell Alastair Sim as Professor Ernst Kronak Syd Crossley as Uncle Alfred Mignon O'Doherty as Dr. Buckley Fred Emney as Sir George Denberry-Baxter Charles Hawtrey as Young Orton A. Bromley Davenport as Agent Joss Ambler Charles Victor Peter Gawthorne as Major Shiptonthorpe George Merritt as Police Sergeant Gus McNaughton as Ketley Eliot Makeham as Town Clerk Aubrey Mallalieu as Commander Spofforth Morris Harvey as Jim Flagg Michael Martin Harvey as Handover Olive Sloane as Daisy Barley Maire O'Neill as Mrs. Mitterley Diana Beaumont as Secretary Ian Fleming as United Plastics Barrister Frank Atkinson Patricia Roc as Hope Ollerton Peter Ustinov as Dr. Bentika Edward Rigby as Timmy Tiverton Oliver Wakefield as Sir Reginald Foxfield