 Complete the following phrase:  Returning to Britain in June 1947, he undertook a six-month course at the Staff College, before receiving a two-year posting as senior personnel staff officer of No. 21 Group, Flying Training Command. Promoted to wing commander on 1 July 1947, his next posting was as the senior instructor on the leadership course at Digby, Lincolnshire. Subsequently, he was appointed station commander at Wattisham, Suffolk. He was promoted to group captain on 1 January 1954. Edwards was the Station Commander of the RAF base RAF Habbaniya in Iraq during the Suez Crisis of 1956, and also the critical time of the 