Diana Marilyn Quick (born 23 November 1946) is an English actress. Quick was born in London, England. She grew up in Dartford, Kent, the third of a dentist's four children. She was educated at Dartford Grammar School for Girls, Kent. She was greatly aided by her English teacher, Miss Davis, who encouraged her to pursue acting. She became a member of an amateur dramatic society in Crayford, Kent whilst at school as well as appearing in many school productions. On leaving school she went on in 1964 to pursue further studies at Lady Margaret Hall, Oxford. Quick was the first female president of the Oxford University Dramatic Society. Her longtime partner was actor Bill Nighy and they have one daughter, the actress Mary Nighy (born 1984). They separated in 2008. The couple met in 1981 when co-starring in a play at the National Theatre in London. She was previously married to the actor Kenneth Cranham for a short time and had a relationship with Albert Finney which lasted seven years.