In 1952 the LPO negotiated a five-year contract with Decca Records, which was unusually rewarding for the orchestra, giving it a 10 per cent commission on most sales. On top of this, Boult always contributed his share of the recording fees to the orchestra's funds. In the same year, the LPO survived a crisis when Russell was dismissed as its managing director. He was an avowed member of the Communist party; when the cold war began some influential members of the LPO felt that Russell's private political affiliations compromised the orchestra, and pressed for his dismissal. Boult, as the orchestra's chief conductor, stood up for Russell, but when matters came to a head Boult ceased to protect him. Deprived of that crucial support, Russell was forced out. Kennedy speculates that Boult's change of mind was due to a growing conviction that the orchestra would be "seriously jeopardized financially" if Russell remained in post.  A later writer, Richard Witts, suggests that Boult sacrificed Russell because he believed doing so would enhance the LPO's chance of being appointed resident orchestra at the Royal Festival Hall.In 1953 Boult once again took charge of the orchestral music at a coronation, conducting an ensemble drawn from UK orchestras at the coronation of Elizabeth II. During the proceedings, he conducted the first performances of Bliss's Processional and Walton's march Orb and Sceptre.  In the same year he returned to the Proms after a three-year absence, conducting the LPO. The notices were mixed: The Times found a Brahms symphony "rather colourless, imprecise and uninspiring", but praised Boult and the orchestra's performance of The Planets. In the same year the orchestra celebrated its 21st birthday, giving a series of concerts at the Festival Hall and the Royal Albert Hall in which Boult was joined by guest conductors including Paul Kletzki, Jean Martinon,  Hans Schmidt-Isserstedt, Georg Solti, Walter Susskind and Vaughan Williams.In 1956 Boult and the LPO visited Russia. Boult had not wished to go on the tour because flying hurt his ears, and long land journeys hurt his back. The Soviet authorities threatened to cancel the tour if he did not lead it, and he felt obliged to go. The LPO gave nine concerts in Moscow and four in Leningrad.  Boult's assistant conductors were Anatole Fistoulari and George Hurst. Boult's four Moscow programmes included Vaughan Williams's Fourth and Fifth Symphonies, Holst's The Planets, Walton's Violin Concerto (with Alfredo Campoli as soloist), and Schubert's Great C major Symphony. While in Moscow, Boult and his wife visited the Bolshoi Opera and were guests at the composer Dmitri Shostakovich's 50th birthday party.After the Russian tour, Boult told the LPO that he wished to step down from the principal conductorship. He continued to be the orchestra's main conductor until his successor William Steinberg took up the post in 1959.  After the sudden resignation of Andrzej Panufnik from the City of Birmingham Symphony Orchestra (CBSO), Boult returned as principal conductor of the CBSO for the 1959–60 season. That was his last chief conductorship, though he remained closely associated with the LPO as its president and a guest conductor until his retirement.

Question: What was the specific proceeding during which Boult conducted the first performances of Walton's march Orb and Sceptre and Bliss's Processional?
Answer: the coronation of Elizabeth II