Delia Derbyshire - the woman behind Doctor Who theme

Delia Derbyshire is best known as the uncredited creator of the Doctor Who theme tune.

A sonic innovator in the BBC Radiophonic Workshop, she received very little acclaim during her lifetime but her reputation has grown since her death in 2001.

Robin Warren, a reporter for Radio 4's The World Tonight, went along to the third annual Delia Derbyshire Day to celebrate her pioneering legacy.