In any case, Hitler would know that, and if he did not his generals would.You have it backwards Britain would be hit hard to be sure but Germany isn't going to be able to hit it with anything strong enough in sufficient quantity to prevent retaliation and once that happens Germany is the one that will be on the short end of the stick. Depending on prevailing winds and just how far down the rabbit hole Britain is willing to go you could see large swaths of Europe to this day that are deadzones if they were willing to go that far.