After mid-1940, Britain controlled the sea and air and after the winter of 1941-42, the Soviets took the initiative on land.
While American involvement shortened the war, thereby saving the lives of thousands of Britons, it saved millions of Germans. Prime Minister Churchill would certainly have been willing to nuke German cities, if any could have been found after the Red Army had its way.
“After mid-1940, Britain controlled the sea and air...”
BS. It wasn’t until the summer of ‘42 that the allies even had a strategy to deal with German wolfpacks sinking huge tonnage of materiel. By 1940, the British were all but knocked out of the war.