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Her television and film credits include The IT Crowd, Gavin and Stacey, Run Fatboy Run, Casualty, The Royal, Asylum, The Bill, Where the Heart Is, Gimme Gimme Gimme, The Hunger Games, At Home with the Braithwaites and The Liver Birds.
In 2009, she played the role of Mrs Harries, the mother of Josephine Tewson in the radio drama, Leaves in Autumn by Susan Casanove, a Wireless Theatre Company production. In 2010, she appeared as Peggy Lowe in the Jo Brand BBC2 comedy Getting On. She also has the minor role of Maureen Bright in the BBC soap opera, Doctors in 2011. In 2013 she appeared in the British Sitcom Vicious starring Ian McKellen and Derek Jacobi as Mildred, Stuart's (Jacobi) mother. Most recently, Douglas portrayed Edna Locke in an episode of the 2014 detective drama Suspects (TV series).