Holds the distinction of playing the last client to be defended by Perry Mason in the 1957-66 TV series by that name.
When she took on her final major television role in a 1979 episode of Quincy, she officially became, at age 96, the oldest actor working in the U.S., narrowly beating fellow British actress Ethel Griffies.
On her 100th birthday, Winwood was asked how it felt to have lived so long, she replied "How rude of you to remind me!".
She is sometimes confused with the classic Hollywood comic scream queen Una O'Connor.
With her mother's support, but her father's disapproval, she trained with the Lyric Stage Academy in London, before making her professional debut in Johannesburg at the age of 20.