The German Navy was not up to the task of invading Britain, especially after the losses in the Norway campaign. Also, the Germans would need air superiority over Britain and the surrounding seas to ensure any armada could be safely escorted by the Luftwaffe across the Channel rather than being bombed by the RAF. However the RAF won the Battle of Britain, the air battle over the skies of southern England in summer 1940, thus defeating German hopes of air superiority.

Any invasion attempted in the face of the Royal Navy's naval supremacy and the RAF's control of the air would most likely have failed.