It has never failed to amaze me how British industry, after a very low start, was kicked into a massive output of the weapons needed to fight WW2 after Dunkirk.
Under Lord Beaverbrook the production of especially the Spitfire, then other aircraft, zoomed to not only replace all the aircraft lost during The Battle of Britain, but then gave the RAF everything they materially needed, although at first a shortage of pilots to fly them was THE major issue.
The Nazis had been out producing everyone in not just planes, but tanks and guns as well. However, with the efforts of hundreds of British factories, and especially at the new, purpose built aircraft plant of Castle Bromwich, run by Vickers-Armstrong, the production lines quickly out produced those of Germany. Planes, tanks, guns, lorries all rolled off en mass of British production lines.
In fact the Luftwaffe never recovered from the losses of fighters and bombers, along with experienced pilots, sustained during The B of B, plus also transport aircraft (especially the J52's with experienced pilots) over Crete, which greatly weakened the Sixth Army's efforts during the latter half of the Russian, BARBAROSSA campaign. The German plants produced less and less, weakened by experienced engineers being called up to fight in the Soviet Union, Allied bombing, and a lack of materials, like metal, coal to produce that metal, and oil. Money also ran out for the Nazis.
So "The Numbers" certainly gave the British the time to stave off the Nazis, then along came America to give a completely new boost to production figures. The huge numbers defeated the Nazis. It is just a shame to think that today the British industries could never respond so gallantly to the threat of an immediate major war, if they were even given the time to do so!