 After nearly four years of instructing, Evill was posted to the RAF College, Cranwell as the Assistant Commandant where he remained until he was succeeded by Philip Babington in late 1931.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.