Film:
* The Importance of Being Earnest (2002) - Miss Prism
* The Hitchhiker's Guide to the Galaxy (2005) - Woman in a Yellow Dress
* The Boat That Rocked (2009) - Mrs. Braithwaite
* The King's Speech (2010) - Queen Mary
* The World's End (2013) - The Pub Landlord's Wife
* Paddington (2014) - Mrs. Bird
* The Lady in the Van (2015) - Mrs. Jones
* The Personal History of David Copperfield (2019) - Aunt Betsey Trotwood
* The Electrical Life of Louis Wain (2021) - Caroline Williams
Television:
* The Vicar of Dibley (1994-2007) - Alice Tinker
* Absolutely Fabulous (1992-2012, 2016) - Various characters
* Roger Rabbit (1996) - Lady Penelope (voice)
* The Office (UK) (2001-2003) - Jennifer Taylor-Clarke
* Nighty Night (2004-2005) - Judy
* Green Wing (2004-2006) - Suzanne
* The Thick of It (2005-2012) - Lynn
* Twenty Twelve (2011-2012) - Sally
* Detectorists (2014-2017) - Lance's Mum
* Inside No. 9 (2014-present) - Various roles
* Call the Midwife (2012-present) - Sister Monica Joan
* The Good Karma Hospital (2017-present) - Dr. Lydia Fonseca
* The Great (2020-present) - General Nina Petrovna
* The Afterparty (2022) - Detective Danner
* The Unremarkable Journey of Mr. Sparrow (2022) - Lady Constance
This is just a selection of her work, and she has starred in many other notable television series and films. She is a versatile actress known for her comedic timing and ability to play a wide range of characters.