No. 51 (Training) Group RAF was formed on 11 May 1939 in Reserve Command at RAF Hendon controlling Elementary and Reserve Flying Training Schools. On 27 May 1940 it was moved to RAF Flying Training Command. It was disbanded on 14 July 1945 and absorbed into No. 50 Group RAF.[1]
Sturtivant, Ray; Hamlin, John (2007). Royal Air Force flying training and support units since 1912. Tonbridge, UK: Air-Britain (Historians). ISBN978-0851-3036-59.