Angela Thorne was born in Karachi, British India, in 1939. The daughter of an Indian Army doctor father, William Herbert Alfred Thorne, and a teacher mother, Sylvia (Leslie), she spent the first five years of her life in India. She was later a pupil at Farlington School in Horsham, West Sussex. She trained for the stage at the Guildhall School of Music and Drama. Her marriage to television actor Peter Penry-Jones lasted from 22 September 1967 until his death in 2009. They had two sons, Laurence and Rupert, both actors.