Rose Hill was born in London and won a scholarship to the Guildhall School of Music and Drama. She started her career as a soprano in 1939, singing at the Sadler's Wells Opera (later English National Opera) in London; soubrette and lyric soprano roles such as Despina in Così fan tutte. For the Glyndebourne Festival she sang Barbarina in Le nozze di Figaro. In 1948 she sang Lucy in the world premiere of Benjamin Britten's adaptation of The Beggar's Opera.
Rose Hill's career in film and TV started with the 1958 film The Bank Raiders and ended in 1994 with a guest appearance in A Touch of Frost. Her longest-running role as an actress was as Madame Fanny La Fan in the British sitcom 'Allo 'Allo!, in which she featured from 1982 to 1992.
She spent her final years in Denville Hall, a retirement home for actors, until her death in 2003.
Flanders and Swan wrote a song for Rose Hill. See http://www.donaldswann.co.uk/biog.html.