It was considered as a serious threat in Britain throughout 1940 and was certainly seriously considered as an option by the Nazi high command throughout that year: even if we ignore the known existence of blueprints, plans and proposals, their actions alone are suggestive of this - there would have been no point in the Battle of Britain otherwise.
That‘s completely false. German High Command, including Hitler, were well aware that invading Britain would be, in all likelihood, completely suicidal. But they hadn’t given up making Britain back down through other means. One of those means was a defeat in the air so Britain would accept peace terms. That was the main reasons for the Battle of Britain, although it’s possible that if the defeat had occurred decisively, Hitler may have ordered an invasion.
In my opinion, it might’ve been better for the UK to actually not prepare for the invasion on the surface, entice Germany to invade, utterly annihilate them, and keep fighting from that point.
Even if the Nazis had no chance to successfully invade Britain, they still could have potentially killed millions of civilians and no sane nation would risk losing millions of their own civilians.
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