In that same year she appeared in Les Equilibristes and in Mike Newell's Enchanted April, in which she played an aristocrat eager to escape the attentions of her persistent male admirers.
[4] Walker first gained international attention in 1992 as a single-minded English member of an Irish terrorist group in Phillip Noyce's Patriot Games.
[7][8] She next played the sinister Catherine Braithwaite in "Deus Ex Machina", a two-episode story of the BBC television "cold case" crime series Waking the Dead, which also aired in January 2007.
In May 2007, she appeared as Lady Bess Sedgwick in ITV's Marple: At Bertram's Hotel,[9] and then played sugar heiress Ellis Samuels in the CBS television drama Cane, which premiered 25 September 2007.
[10] In May 2008, Walker was cast as Sister Clarice Willow, headmistress of a private religious school, in Syfy's Battlestar Galactica prequel series Caprica.
[16] In 2020, she appeared as Lady Lunete, the Queen Regent and mother to Uther Pendragon, a recurring character for 5 episodes in the Netflix series, Cursed.