The smart idea with tin foil was known by both sides early on. Nobody wanted to be the first to use it because... the opposition would then also use it. So, both just kept it to themselves.
True, early bombing was lucky if they hit the right country, with the exception of the stuka. Even so, hitting a lattice mast is not so easy. Damage it is even more difficult. The bomb blast will just go through the lattice work.
What Dowden feared was that the area stations copuld be hit. Those were either sitting in a hut above ground or just in a basement, but typically on the airfield itself.
If that had been understood, the centres with all their commuications equipment, telephone lines and personnel could not easily be replaced. A lattice mast is not so difficult to get back in business.
So, let's imagine that LW with new machines, drop tanks, the works, are master's of the skies over South East England.
US is not in the war at that time. We are talking August 1940. Still nearly 1 1/2 year to go.
Then what? if they slack RAF might be back, which will mean no additional forces for Barbarossa.
Invasion fears in 1940 in the German command? I don't think that was high on the agenda.
The Channel would have been closed. However, they transported coal on coastal conveys. The only one thing railways were far better at. Churchill wanted to establish that the Channel was not closed; hence the costal convoyes until somneone told him to stop the nonsense.
But what would it have decided in a strategic context?
Could it even have been sustained for months or years?
Let's now imagine that LW can bomb any factory or anything else they desiore in the entire South East (up to about London).
The sea creature which-must-not-be-named is still not a real option because of RN.
Could they do a "Crete" invasion at Land's End or capture Torbay? It is a bit Cul-de-Sac.
The interesting one is if Churchill gets voted out and Halifax starts on the peace terms because a part of Britain is lost
Holding South-East hostage might be a great idea after all. It could end up in a draw.
Ivan