In May 1939, Monnington joined the Directorate of Camouflage at
Leamington Spa where he worked on camouflage designs for airfields and factories. He also, after a chance meeting with
Barnes Wallis, contributed design improvements, now in the
Victoria & Albert Museum, to a new heavy bomber aircraft then being developed which later became the
Avro Lancaster. In 1943 Monnington, who had taken flying lessons before the war, wrote to the
War Artists' Advisory Committee, WAAC, complaining of the lack of an aerial perspective among the works WAAC had so far commissioned. and especially those such as
Fighter Affiliation. from a perspective inside the aircraft, were to be among the most important such images in the WAAC collection. ==Post-war career==