York died of cancer on Saturday at the Royal Marsden Hospital in London.
Her son, the actor Orlando Wells, said York was an incredibly brave woman who did not complain about her illness and was a “truly wonderful mother”. He said she went into hospital on January 6 after experiencing shoulder pain.
York had a long, distinguished career on film, television and on stage, but she is best remembered for her early roles that started in 1963 as Albert Finney’s love interest in Tom Jones.
York was nominated for an Oscar for the 1969 classic They Shoot Horses, Don’t They? and starred in A Man for All Seasons.