Sheila Dunn

Sheila Dunn (11 April 1940-3 March 2004) appeared in several Doctor Who stories: as Blossom Lefavre in TV: The Daleks' Master Plan, the computer voice of the Electromatic company in part two of The Invasion and Petra Williams in Inferno. She was married to television director Douglas Camfield, who directed all three of those stories.