Desc: Black Sheep of Whitehall: Directed by Basil Dearden, Will Hay. With Will Hay, John Mills, Basil Sydney, Henry Hewitt. Professor Davis, who teaches at a correspondence school, discovers that a Nazi Agent is trying to prevent a trade treaty being signed between England and South America. The agent is posing as an economics expert seconded to the trade delegation. The professor must find the real economist and expose the agent.