Evill remained in the fledgling RAF after the war and in 1919 he was placed in command of flying boat units, granted a permanent commission in the RAF in the rank of
squadron leader and awarded the
Air Force Cross. After departing Cranwell, Evill was promoted to
group captain in the new year. After a period of illness and time as a
supernumerary which occupied most of 1932, Evill attended the
Imperial Defence College in 1933. In the five years leading up to the
Second World War Evill held a number of
air officer staff and administrative appointments. In April 1934, he was sent to the
Air Ministry and served as Deputy Director of War Organization. He was promoted to
air commodore on the last day of 1935; this promotion may have coincided with his elevation to Director of War Organization. Just before the outbreak of the Second World War, Evill briefly served as the British air deputy on the
Anglo-French Supreme War Council. ==Second World War==