As a man who looks up to the Whermacht for their military prowess and courage, I will be the first to say that Sealion was impossible without some serious British fuckups. But what mystifies me is why so many people focus on the landing being impossible, which I disagree with. IF the Luftwaffe gained total air superiority, a big if, then a landing is plausible, and even not getting chocked off by the RN is possible (somewhat). The real problem lies in what to do once the Germans are on the island. The landings will take heavy losses, and the Home Guard will make a fast advance impossible. Every house will be a strong point, every village a fortress. Despite the low quality of these troops, there is a heck of a lot of them. Add to that the intact British defensive lines inland, and the Germans will have a hell of a time doing anything. The best possible result is a stalemate on the Thames, that's it.