Dame Harriet Mary Walter, DBE is an English stage and screen actress. Her film appearances include Sense and Sensibility , The Governess , Villa des Roses , Atonement , and Man Up . On television, she starred as Natalie Chandler in the ITV drama series Law amp Order UK , and as Lady Prudence Shackleton in four episodes of Downton Abbey . She was appointed Dame Commander of the Order of the British Empire in 2011 for services to drama.
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Source: Wikipedia