In 1993, Williams made her film debut in Michael Winner's Dirty Weekend.
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).