this film and without doubt and be the clear example of the british humour the german can not understand . one liner run rampant in a film spawn one of the great series of film in british cinema history ( st. trinians ) . the story of bureaucratic incompetence amid post war trial enable frank launder to direct maximum talent from all the cast . it probably the only film in which margaret rutherford meet her match and in alastair sim and for forceful characterisation ( she still win though ) . joyce grenfell ( bless her ) and richard wattis both deserve mention in dighton masterpiece of english etiquette and stiff upper lip under pressure . no rutherford or sim or grenfell fan would be without this in their collection . absolutely brilliant . why positive . only 83mins long .