Swannington was the headquarters for No. 274 Maintenance Unit RAF (MU) for RAF Little Snoring, RAF North Creake and RAF Oulton. All these stations had mothballed Mosquitos of all versions, and there were also several hundred new Rolls-Royce Merlin engines in their crates. Between 1946 and 1947 the role of the site was to service and carry out important modifications to aircraft before they were flown out to a permanent MU for in-depth service, from where they were sold to foreign powers. Airframes which were beyond their sell-by date were towed to the dump and burnt after recovery of spare parts, including engines.