That's right and there was no such thing as a trained night fighter, much less night fighter-bomber in 1940. For an operation like this, they wouldn't even need to commit the larger ships. The destroyers and lighter craft alone could have destroyed any invasion hopes in one swift night raid. Then they had four submarine flotillas in home waters in 1940 - can you see that concentrated in a small body of water and imagine the odds against any large German vessels? I just don't see it happening, control of the air or not. The German high command must have realized the same thing.