Britain out-produced Germany in single-engine fighters right through the Battle of Britain, by two to one even in the Germans' best month.

British historian and writer specialising in the Second World War

And by that time, aircraft production in Britain is massively outpacing the Germans and the best ratio that the Germans achieve in 1940s, July 1940, when the British produced 496 new Hurricanes and Spitfires, single-engine fighters, and the Germans only produced 240 single-engine fighters.