Walton's last work of the 1940s was his music for Olivier's film of "Hamlet" (1948). After that, he focused his attentions on his opera "Troilus and Cressida". On the advice of the BBC, he invited Christopher Hassall to write the libretto. This did not help Walton's relations with the Sitwells, each of whom thought he or she should have been asked to be his librettist. Work continued slowly over the next few years, with many breaks while Walton turned to other things. In 1950 he and Heifetz recorded the Violin Concerto for EMI. In 1951 Walton was knighted. In the same year, he prepared an authorised version of "Façade", which had undergone many revisions since its premiere. In 1953, following the accession of Elizabeth II he was again called on to write a coronation march, "Orb and Sceptre"; he was also commissioned to write a choral setting of the "Te Deum" for the occasion.