The final starring film for Jack Hulbert and Cicely Courtneidge, moving into Will Hay/George Formby territory as inept spies foiling the Nazi war effort.
If you don't like their style of humour, don't watch it; it was a little old-fashioned even when it was made. They are who they are, and moaning about how antiquated 80-year-old comedy is doesn't seem a sensible use of time. But each is near the top of their game.
Courtneidge's masquerade as Carole's maid is a highlight, as is Hulbert's double taking when he spots her. Hulbert's dance to steal back the carburettor is another high point set piece. Of the songs, the best is Cicely's The Empire Depends on You, while drilling a battalion of schoolgirls, and a tour around British accents with an adaptation of Tiger Rag.
A wonderful performance, with hardly any lines, from Glynis Johns, and a blink-and-you-miss-it sighting of Terry-Thomas at the party are welcome additions.