Operational Training Units (OTU) of the Royal Air Force were training units that prepared British and Commonwealth aircrews for operations on a particular type or types of aircraft or roles. These Operational Training Units helped take the pressure off Operational squadrons, which previously would have had training Flights.
22 Operational Training Unit (OTU) was formed at RAF Wellesbourne Mountford on the 14th April 1941 as part of No. 6 Group RAF Bomber Command to train aircrew in night bombing raids with Vickers Wellington twin-engine aircraft. On the 11th May 1942, the 22 OTU was transferred to No. 91 Group with satellite stations at RAF Atherstone, name later changed in May 1942 to RAF STRATFORD, and RAF GAYDON from July 1943.
The 22 OTU was disbanded on the 24th July 1945.