This,Will Hay's penultimate film contains one of his most famous routines on film.A variation on his famous schoolmaster routine.In this he is a teacher in a school for spies teaching such notables as Peter Ustinov and Charles Hawtry how to cope with the intricacies of enunciation in the English language.There is a further scene near the end of the film which was full of puns based on Enlish place names.I was at a lecture given by Peter Ustinov many years ago at the NFT.when asked about Will Hay he said that he remembered him as having cups of tea on his own in a corner of the set.It is interesting that in films made by English comedians during the war,such as Hay ,George Formby and The Crazy Gang,the Nazis are always portrayed as buffoo0ns rather than evil.