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How would the Blitz and air war over Britain at night evolve without a Barbarossa campaign in 1941 (let's say the invasion of Russia never happens ITTL) while a Mediterranean option is playing out, leaving about 1/3rd of the Luftwaffe in the Mediterranean after the Balkan campaign wraps up in May 1941. IOTL the Blitz ended in May 1941 as British night defenses were improving...but also so were Luftwaffe bombing abilities. Historically a fraction of German air power was left in place in France to continue harassing Britain from 1941-44, but never with nearly as much impact as the Blitz had. https://en.wikipedia.org/wiki/The_Blitz#Final_attacks