For television, Mitchell has starred in many of the most popular UK television series ranging from drama to comedy, including "Z-Cars", "Talking to a Stranger", "Up the Junction", "Play for Today", "Upstairs, Downstairs", "Morning Story", "Within These Walls", "Bergerac", "Taggart", "The Detectives", "Kavanagh QC", "Maigret", "The Bill", "EastEnders", "French & Saunders", and "Gimme Gimme Gimme" (written for her by Jonathan Harvey). She co-stars as Lillian in the forthcoming Granada production of Jane Hall’s Big Bad Bus Ride, and was most recently seen as Rita in Tunnel of Love for Thames. As Dolly Rawlins in "Widows" I, II and She’s Out (written for her by Lynda La Plante) she won acclaim and affection. In 2017 she joined the cast of CBBC's "Hetty Feather".