DBWI: What would it took for sea lion to succeed an what would the consequences be?

I mean we all no just how bad the attempt went for the Germans.
But what would it take for Sea Lion to have been successful?
And what would the follow one effect be?
 
I mean we all no just how bad the attempt went for the Germans.
But what would it take for Sea Lion to have been successful?
And what would the follow one effect be?
Take the German army, airfleets and navy from our timeline and put it down in an atl where Germany can use two worlds worth of resources to attempt sea lion. Maybe then they pull it off.

ASB
 
There is a significant "fifth column" or pro-fascist faction in England and they co-operate with the invaders.

Though its not mutually exclusive, another approach is that the British government is hated to the point where its own soldiers, sailors, and airmen do nothing to resist the invasion.

There have been successful invasions of England, but if you go back through English history, they all have the common element in that the invaders had significant support from within England itself. Of course the issue is muddied by the fact that no one, and this includes the Spanish Armada, really attempted to invade the island unless they thought they had significant support from within, Napoleon might be the exception but he may also have been bluffing as much as Hitler later was. Another possible exception was the Norman Conquest, but the Godwinson regime had just been set up and had just beat back another invasion from a rival claimant to the throne, so its internal support was probably pretty flimsy.

An actual opposed invasion would have had the problems, in no particular order, of the Royal Navy, fighting through London (the Germans never solved the problem of taking really large cities that weren't left open for them), a not bad British Army, and of keeping the German army in England supplied across the Channel, and the British being able to draw support from the Commonwealth and ultimately the USA. France, Poland, and Yugoslavia involved no serious terrain obstacles or strategic depth.
 
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