Operation Sealion, the German invasion plan, could never have succeeded in the form it took in 1940. Among other things Rhine River barges would have had trouble crossing the channel without swamping, even under ideal conditions on a fine day without being shot at.
A credible cross channel invasion plan would have taken the Germans almost as long to devise as it took the allies to prepare for D-Day.
If Barbarossa had been postponed and the Battle of Britain had continued the main effect would have been on the RAF Bomber Command and later the 8th Air Force.
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