Armed only with good Christian values and a sharp tongue, Mary Whitehouse's mission was to stop filth entering family homes via the media.  Remarkably in 1967, the epicentre of the most liberal decade in history, she forced the resignation of the BBC's Director-General after a row over the Beatles' use of the word "knickers".  This film shows us how she did it.

Starring Julie Walters as Mary Whitehouse; Alun Armstrong as her husband Ernest; and Hugh Bonneville as Hugh Carleton Greene.