With Hurricanes rolling down the production tine in 1937, the RAF had already turned its thoughts to replacing both it and the Spitfire. Yet the first production example of the Supermarine fighter was not to appear until May 1938. But the RAF was not the only body looking ahead, Sydney Camm's design team at Kingston-on-Thames was also on the case. Specification F18/37 sought all-out speed and a formidable armament, a dozen Browning machine-guns or six 20mm cannon.
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