In this investigative three-part series for BBC Four, filmmaker Gillian Pachter re-examines the Ruth Ellis case. 　　In July 1955, Ruth was the last woman to be hanged in Britain. Her crime: the cold-blooded murder of her lover David Blakely. 　　It is a case that shocked the nation and still fascinates today. It has its place in ushering in the defence of diminished responsibility and...