[1] When tested in 1929 and 1930, it showed unsatisfactory handling characteristics and was rejected by the RAF in favour of the Hawker Fury biplane fighter.

The main requirement was that the F.20/27 fighter would be able to overtake, in the shortest possible time, an enemy aircraft passing overhead at 150 mph (240 km/h) at an altitude of 20,000 feet (6,100 metres).

[3] The Interceptor was a low-wing monoplane with an all-metal structure and wire-braced wings, covered mostly in fabric with the exception of the front fuselage.

"[4] In steep turns the elevator became ineffective, and the aircraft was prone to enter a spiral dive or a spin from such flight attitudes.

However, all three were found lacking in overall performance and handling during the test flights, showing that the aircraft designers had failed to reach the project goal.