Cynthia Elaine Grenville Smith known professionally as Cynthia Grenville was an actress, known for Ivanhoe (1997), Doctor Who (1963) and Within These Walls (1974) as well as many others.
Secrets 1983
as Miss Johnson
The Network 1979
as Lyn Green
Doctor Who: The Brain of Morbius 1976
as Maren
Credits from TMDB.