She is also known for her appearances in the BBC adaptations of three of the Narnia books, most notably as the tyrannical White Witch in "The Lion, the Witch & the Wardrobe" (1988). A year later she had a minor role as the Old Hag (Narnian Hag) in "Prince Caspian" in (1989), and finally as the evil Lady of the Green Kirtle in "The Silver Chair" in 1990. On the radio, she portrayed Modesty Blaise in a 1978 BBC World Service adaptation of the novel "Last Day in Limbo".