Harker is known for her roles as Celia in the
BBC's
Middlemarch, and as Woman Police Constable (WPC) (later Detective Sgt.) Hazel Wallace in the
ITV police drama
A Touch of Frost (1992–2003). She also played Alicia Davenport in
Coronation Street for four episodes in 2012. and in a TV adaptation of
Jilly Cooper's
Riders They have three daughters. From January 2023, Harker starred as Clairee in a production of
Steel Magnolias at the
Richmond Theatre, London. Harker appeared alongside
Lucy Speed,
Diana Vickers, and Elizabeth Ayodele. The production, going on to tour the UK, was rated 2/5 stars by ''What's on Stage
. In January 2025, Harker debuted as Dr. Caitlin Todd in the ITV soap opera Emmerdale''. She initially appeared as a minor character in early 2025, before being reintroduced in 2026 as part of a prominent storyline involving her character being a workplace bully. ==Filmography==