Prototype and Test Evaluation Fleet Air Arm and Commonwealth aircraft types were tested or service evaluated by the Royal Navy, the Aeroplane and Armament Experimental Establishment (A&AEE) at Boscombe Down, or the Royal Aircraft Establishment (RAE), Farnborough between 1939 and 1945. The Typhoon Mk.IB, widely known as the Tiffy, distinguished itself particularly in the Battle of Normandy. In one famous case Tiffies of the 2nd Tactical Air Force decimated a large concentration of armor ahead of Avranches, disposing of no fewer than 137 tanks, and opening the way for the liberation of France and Belgium.



