July 1945, Deere took over leadership of the Polish P-51 Mustang wing based at Andrew's Field in Essex. This command lasted until October, when the wing was disbanded, and he was appointed commanding officer of RAF Duxford. He also received a permanent commission, as a squadron leader, in the RAF on 1 September 1945, although he continued to retain his acting wartime rank of wing commander. At the end of the year, he was appointed to the Order of the British Empire in recognition of his military service. In August 1946 Deere commenced a nine-month course on air strategy at the Air University in Alabama. On returning to the United Kingdom in June 1947, he was posted to the staff of Air Headquarters in Malta, commencing in July. He remained in the role for two years, which included a period of leave in New Zealand. Once back in the United Kingdom, he joined the staff of No. 61 Group, based at Kenley. His acting rank of wing commander was made permanent on 1 July 1951, and at the end of the year he took up a post at Fighter Command's No. 11 Group, at the headquarters of its northern sector at RAF Linton-on-Ouse, in North Yorkshire. Deere returned to his former wartime base at RAF North Weald in May 1952, becoming the station's commander. Part of his work at the station involved organising and supervising the construction of a new control tower. He kept his hand in on flight duties, flying Gloster Meteors, including one on a demonstration flight to Hornchurch in 1953 for celebrations of the anniversary of the Battle of Britain. In June 1954 he was posted to Germany, where he acted as an administrator at the headquarters of the 2nd Tactical Air Force, based at Wildenrath. From March 1957 he began instructing at the RAF Staff College in Bracknell and later that year was promoted to group captain. In between his instructing duties at Bracknell, Deere worked on his autobiography. He had been inspired to do so by his return to Hornchurch a few years previously, which had prompted memories of his wartime service there. This was published by Hodder & Stoughton in 1959 as Nine Lives, a reference to his many close calls, to largely favourable reviews. Deere's teaching duties at Bracknell ended in late 1959 and, after a short period at Transport Command in a