<P> Other recent television appearances include supporting roles in the Agatha Christie adaptations Sparkling Cyanide (2003) and By the Pricking of My Thumbs (2006), and guest roles in series such as Casualty (1989), Silent Witness (2002), Heartbeat (2002), The Last Detective (2005), A Touch of Frost (2005), and Midsomer Murders (2015). </P> <P> In September 2009, Williams joined the cast of the ITV comedy drama series Doc Martin . </P> <P> In 2016, she appeared in the second series of The Missing as Nadia Herz . </P> <P> In 2016, she played the part of Wallis, Duchess of Windsor in the Netflix series The Crown . </P>

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