 Chidlaw-Roberts returned to active duty on 12 May 1942 when he was commissioned as a pilot officer (emergency) in the General Duties Branch of the Royal Air Force Volunteer Reserve.On 1 September 1944 Flight Lieutenant Chidlaw-Roberts was awarded the Air Force Cross.He remained in the RAF post-war, and on 1 November 1947 was granted the substantive rank of flying officer, with seniority from 12 May 1943.