Dalton was in a relationship with English actress Vanessa Redgrave ( with whom he appeared in the 1971 film `` Mary , Queen of Scots '' and the 1979 film `` Agatha '' ) between 1971 and 1986 .
He was in a relationship with English actress Vanessa Redgrave ( with whom he appeared in the 1971 film `` Mary , Queen of Scots '' ) between 1971 and 1986 .