A look back at some of cinema's best-loved partnerships, from Fred and Ginger, Doris Day and Rock Hudson, to Newman and Redford, and even Nick Frost and Simon Pegg. With interviews and appearances on the BBC over the years, we tell the stories of the stars who, regardless of whether they were friends or rivals, audiences just loved to see up on the big screen together - their collaborations creating an alchemy that resulted in box office gold.

Celia Imrie tells the story of Glenda Jackson, one of Britain's greatest-ever acting talents, who famously turned her back on her hugely successful screen career to pursue a life in politics.