 Evill left the Air Ministry in September 1936 for Headquarters Bomber Command where he served as the Senior Air Staff Officer.In January 1937, whilst on the staff of Bomber Command, Evill accompanied Air Vice Marshal Christopher Courtney (the RAF's Director of Operations and Intelligence) as a member of the RAF mission to Germany on a tour of inspection of the Luftwaffe.On 1 January 1938 Evill was promoted to air vice marshal, three months later he was appointed Air Officer in charge of Administration at Bomber Command.