Will Hay was approaching the end of his screen career by 1942, and the quality of his work had suffered after he decided to dispense with the services of Moore Marriott and Graham Moffatt. While The Black Sheep of Whitehall has its moments, it never reaches the heights of his earlier work. John Mills provides energetic suppport, but he never seemed comfortable in comic roles, and fails to provide the kind of repartee upon which Hay's brand of humour depended.