After Dunkirk, England was at the head of an empire that numbered over half a billion people - a quarter of the world's population, a similar industrial output to Germany, uncontested dominance of the seas, and a sympathetic United States that was supplying food, munitions, and warships.

It was a far closer fight than the United States and Japan. An invasion of the isles would have been impossible to pull off, and the war would almost certainly had gone the same way that it did - years of fighting over African colonies.