Wilton began her career on stage in 1969 at the
Nottingham Playhouse. Her early roles included
Cordelia in
King Lear, both in Nottingham and at
The Old Vic. She made her
Broadway debut in March 1971 when she played Araminta in the original Broadway production of
The Philanthropist, and made her
West End debut in August 1971 opposite Sir
Ralph Richardson in the
John Osborne play
West of Suez at the
Cambridge Theatre. She had previously appeared in both plays at the
Royal Court Theatre. She played Ruth in the original 1974 London stage production of
Alan Ayckbourn's
Norman Conquests trilogy, initially as understudy for
Bridget Turner. Her television acting career began in 1972, playing Vivie Warren in the BBC2's adaptation of ''
Mrs. Warren's Profession opposite Coral Browne in the title role and Robert Powell. The production was repeated as part of the Play of the Month series in 1974 on BBC1. In 1994, Wilton portrayed Browne in a radio adaptation of An Englishman Abroad'' for the
BBC World Service and repeated on various BBC radio formats since. Following the broadcast of ''Mrs. Warren's Profession
, Wilton then had several major TV roles, including two of the BBC Television Shakespeare productions (as Desdemona in Othello and Regan in King Lear''). Wilton's film career includes roles in ''
The French Lieutenant's Woman (1981), Cry Freedom (1987), Iris (2001), Calendar Girls (2003) and Shaun of the Dead'' (2004),
Jane Austen's
Pride & Prejudice (2005),
Woody Allen's
Match Point (2005), and in
The History Boys (2006). She did not garner fame until she appeared with
Richard Briers in the 1984 BBC situation comedy,
Ever Decreasing Circles, which ran for five years. She played Ann, long suffering wife of Martin (Briers), an obsessive and pedantic "do-gooder". In 2005, Wilton guest starred as
Harriet Jones for two episodes in the BBC's revival of the TV
science-fiction series
Doctor Who. This guest role was written especially for her by the programme's chief writer and executive producer
Russell T. Davies, with whom she had worked on
Bob and Rose (
ITV, 2001). The character of Jones returned as Prime Minister in the
Doctor Who 2005 Christmas special "
The Christmas Invasion". In the first part of the 2008 series finale, "
The Stolen Earth", she made a final appearance, now as the former Prime Minister who sacrifices herself by extermination by the
Daleks so that
the Doctor's companions can contact him. '' co-star
Jim Carter, 2013 Wilton appeared on television as Barbara Poole, the mother of a missing woman, in the BBC television drama series
Five Days in 2005; and in ITV's drama
Half Broken Things (October 2007) and the BBC production of
The Passion (Easter 2008). Beginning in 2010, she appeared as
Isobel Crawley in all six seasons of the hit period drama
Downton Abbey. She was the castaway on
BBC Radio 4's
Desert Island Discs in April 2008. In December 2012 and February 2013, she was the narrator in Lin Coghlan's dramatisation of
Elizabeth Jane Howard's
The Cazalets, broadcast on BBC Radio. ==Personal life==