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Part One - What Didn't Change
Up to 1935-36 exactly the same as OTL as far as single-engine fighter, light bomber and army co-operation design was concerned. So:
The Gladiator prototype still built and flown as OTL;
Specification P.4/34 was the same as OTL, with the same aircraft being built to meet it;
Specification F.5/34 was the same as OTL, with the same aircraft being built to meet it;
Specification A.39/34 was the same as OTL, with the same aircraft being built to meet it;
Specification F.9/35 was the same as OTL, with the same aircraft being built to meet it.
However, there was a change in twin engine fighters with the issue of a specification in the 1934-35 financial year for a twin engine fighter powered by 2 Merlin or 2 Taurus engines to compliment the Hurricane and Spitfire. Prototypes were ordered from Bristol and Gloster.