As the last class passed out of RAF Croughton on 24 March 1943, the glider school closed down. It continued to be a training base, but now it was a satellite for Kidlington in Oxfordshire where the No. 20 (Pilots) Advanced Flying Unit RAF (AFU) gave refresher or advanced training to pilots. Established in 1942, the AFUs provided refresher courses to pilots trained overseas under the British Commonwealth Air Training Plan. It also gave newly qualified pilots experience with flying in British weather and handling heavier aircraft. With the No. 20 AFU, this meant the Airspeed Oxford. Pilots training with these aircraft knew they were destined for either Bomber or Coastal Command.