Given the following context:  In 1956 Walton sold his London house and took up full-time residence on Ischia. He built a hilltop house at Forio and called it La Mortella. Susana Walton created a magnificent garden there. Walton's other works of the 1950s include the music for a fourth Shakespeare film, Olivier's Richard III, and the Cello Concerto (1956), written for Gregor Piatigorsky, who gave the premiere in January 1957 with the Boston Symphony Orchestra and the conductor Charles Munch. Some critics felt that the concerto was old-fashioned; Peter Heyworth wrote that there was little in the work that would have startled an audience in the year the Titanic met its iceberg (1912). It has nevertheless entered the regular repertoire, performed by Paul Tortelier, Yo-Yo Ma, Lynn Harrell and Pierre Fournier among others. In 1966 Walton successfully underwent surgery for lung cancer. Until then he had been an inveterate pipe-smoker, but after the operation he never smoked again. While he was convalescing, he worked on a one-act comic opera, The Bear, which was premiered at Britten's Aldeburgh Festival, in June 1966, and enthusiastically received. Walton had become so used to being written off by music critics that he felt "there must be something wrong when the worms turned on some praise." Walton received the Order of Merit in 1967, the fourth composer to be so honoured, after Elgar, Vaughan Williams and Britten.Walton's orchestral works of the 1960s include his Second Symphony (1960), Variations on a Theme by Hindemith (1963), Capriccio burlesco (1968), and Improvisations on an Impromptu of Benjamin Britten (1969). His song cycles from this period were composed for Peter Pears (Anon. in Love, 1960) and Schwarzkopf (A Song for the Lord Mayor's Table, 1962). He was commissioned to compose a score for the 1969 film Battle of Britain, but the film company rejected most of his score, replacing it with music by Ron Goodwin. A concert suite of Walton's score was published and recorded after Walton's death. After his experience over Battle of...  answer the following question:  Who was commissioned to compose a score for the 1969 film, Battle of Britain?
Walton