The Black Sheep Of Whitehall (1942)

Will Hay plays Professor Davis, the intrepid head of a correspondence college, in this wartime comedy. Davis gets wind of the fact that a Nazi spy has infiltrated an economic delegation with the intent of undermining attempts to reach a trade agreement between Great Britain and certain South American countries. The effort to expose the dastardly fellow sees Hay adopt various disguises in a steady onslaught of mistaken-identity comedy.