[Franek Grabowski]

Well, there is always something called deception. If Germans were to convince Britons they want to invade them, they needed to do something more than to say about invasion. Wehrmacht had nothing to do, anyway, so some exercises would not cause any harm. Equipment necessary for an invasion may have been used elsewhere, so development was not as senseless as it may seem. Increased radio traffic was important as well. Germans were not that stupid not to know that there are spies around.
Whatever were intentions, and the actual role of the Soviet Union, the fact is that some authors claim that the Battle of Britain never occurred.
I have an insight into the Battle from pilot's perspective, and not strategic one, and based on that, this was not another ordinary period. For those men it was desperate struggle to counter enemy, and many of them never again flew so intense missions.
That said, attempts to revision history were undertaken much earlier, but now they are just utterly arrogant. And I do not mean natural increase of our knowledge, and reduction of propaganda's influence.