During 1936-7 Cardington started building barrage balloons; it became the No 1 RAF Balloon Training Unit responsible for the storage and training of balloon operators and drivers. From 1943 to 1967 it was home to the RAF meteorological research balloons training unit, undertaking development and storage.
When filming Squadron 992, Harry Watt and a number of his team were arrested in error as 'Nazi spies' and spent several hours in jail. (The Scotsman - Tuesday 09 July 1940)
The title Squadron 992 was probably used for the purposes of enemy disinformation. The actual squadron number was 929 (incorporating 949)