The Arsenal was one of a series of fast French light fighter aircraft under development at the start of WWII, but which matured too late to see extensive service in the Armée de l'Air during the Battle of France.
Heinkel He 113 "Super Fighter" which saw action in the Battle of Britain. The German propaganda claimed it flew in the B of B, but they never built more than the one prototype shown in commercial registration markings.
Napier Heston Racer (G-AFOX) Was a British Single Seat Racing Monoplane Designed for an Attempt on the World Air Speed Record - The Prototype Crashed on its Maiden Flight, Destroying the Aircraft. The Company Decided to Cancel the Program