Theatre Sanderson appeared in repertory theatres, on the
West End stage, and at the
Stratford Memorial Theatre, where she made her début in 1939 playing Emilia in
The Comedy of Errors, a phase in her career that culminated in 1953 when she played both
Goneril to
Michael Redgrave's
King Lear, and
Queen Margaret in
Richard III. During the
Second World War, Sanderson gained experience in repertory and toured North Africa and Italy entertaining the troops. In 1948, she married fellow actor Gregory Moseley.
TV and film Sanderson played Doris Ewell in the television comedy series
Please Sir! (1968–72) and Mrs Pugh-Critchley, in the series
All Gas and Gaiters (1970–71), as well as a role in the short-lived sitcom
Wild, Wild Women (1969). In 1978 she appeared in an episode of
Rising Damp, and the following year she played Mrs Richards in the
Fawlty Towers episode "Communication Problems". She also appeared in
After Henry, which was broadcast on the
radio (1985–88) and
television (1988–92), in which she played Eleanor. Sanderson's film roles were rare, but she appeared in the
Hylda Baker film ''
She Knows Y'Know (1962), Who Killed the Cat? (1966), the film version of Please Sir! (1971), The Great Muppet Caper'' (1981), playing
John Cleese's wife, and
Prick Up Your Ears (1987), the film based on the life of playwright
Joe Orton. ==Personal life and death==