In May 1946, No. 504 Squadron reformed at RAF Syerston and returned to Hucknall operating the de Havilland Mosquito NF.30 in the night-fighter role. The new commanding officer was Squadron Leader A H Rook DFC AFC. In May 1948, the Mosquitos were replaced by the Supermarine Spitfire F.22 in the day-fighter role, with Squadron Leader J M Birkin DFC AFC taking over command and Sir Hugh Seely becoming the Honorary Vice Commodore. In March 1950 the squadron completed the move to RAF Wymeswold.