The British had the Hurricane, Spitfire, Defiant, Typhoon, Tornado and Whirlwind under development or in service when war started. Two abandoned because of engines (Vulture and Peregrine) Defiant because it didnt work. The three that were left complimented each other, Hurricane could be made quickly, Spitfire became a great aircraft, Typhoon/Tempest/Sea Fury also became good aircraft, if not exactly as planned. However as soon as war started the UK immediately realised it didnt have anything to do photo recon over enemy territory or any long range "heavy fighter" worthy of the name.I guess this is where industrial advantage comes into play. With a big enough industrial base, a nation could go with both "tried and true" and go out on limb as well.
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