Walton revised the score of "Troilus and Cressida", and the opera was staged at Covent Garden in 1976. Once again it was plagued by misfortune while in preparation. Walton was in poor health; Previn, who was to conduct, also fell ill; and the tenor chosen for Troilus pulled out. As in 1954, the critics were generally tepid. Some of Walton's final artistic endeavours were in collaboration with the film-maker Tony Palmer. Walton took part in Palmer's profile of him, "At the Haunted End of the Day", in 1981, and in 1982 Walton and his wife played the cameo roles of King Frederick Augustus and Queen Maria of Saxony in Palmer's nine-hour film "Wagner".