Following the work control of the station passed from 5 Group to 1 Group with a new arrival following the upgrade being 1690 Bomber Defence Training Flight (BDTF) which arrived on 13 July 1944. The BDTF consisted of Spitfires, Hurricanes and Martinets, the flight undertaking fighter affiliation against bombers. This unit stayed at the station until September 1944, when it moved to RAF Metheringham. It was replaced by 1687 BDTF which arrived in early December 1944, and departed for RAF Hemswell in April 1945.