Her husband, Tony Samuel, had previously been married to Beth Rogan. Mercy was his third wife.
Studied at RADA on a scholarship. Began acting in films at the age of eighteen.
During the war, she was evacuated to the Midlands, where she boarded with an outworker for the Redditch needle companies. She spent her holidays potato picking and haymaking during visits to her sister at a Quaker farm run by the Cadbury family near Clent.
Gave up acting in 1966 following her marriage to Tony Samuel, racehorse owner and chairman of the publishing company Herbert Jenkins.
