 On 20 February 1920, he was appointed to the staff of the School of Naval Co-operation and Aerial Navigation and later that year on 8 October he married Henrietta Hortense, the daughter of Sir Alexander Drake Kleinwort (the first of the Kleinwort Baronets).Evill spent much of 1921 at the British Army's Staff College at Camberley.On 1 January 1922 Evill was posted to the headquarters of Coastal Area working on the technical aspects of aircraft carriers.