A strangely anonymous aircraft, never given a name, and only ever known by its Air Ministry specification number F.9/37.
This specification was tendered for by Gloster with an adaption of the two seat turret fighter F.34/35 which lost out to the Boulton Paul Defiant.
The prototype F9/37, L7999 first flew on 3rd April 1939, and proved to be fast, agile and easy to fly.
Fitted with Bristol Taurus engines of 1000hp, it had a top speed of 360mph, and was intended as a night-fighter - in competition with the Beaufighter.
Sadly it was damaged in a landing accident in May 1939.
Rebuilt, and with lower powered engines, it next flew in Spring 1940, with a top speed of 332mph.
A second prototype was built with Rolls Royce Peregrine engines, which had slightly lower performance.
Around this time the project was cancelled, with Gloster being ordered to concentrate on jet powered aircraft.