I found it interesting a couple months ago about the ‘paranoia’ in Brittan. I had always seen their paranoia about paratroopers in a mocking light. But when you go through the fall of France and the low countries, in which there were wide spread reports of paratroop attacks and infiltration, then it makes far more sense.
I would have to think it must have been very unnerving for the British people and especially Whitehall when details of the Belgium fortress of Eben Emael came out. Here was a totally new form of warfare that went up against a perceived impenetrable fortress and it took it out handily.
That 20 miles that separated the Germans from heart of the British Empire must of suddenly seemed minuscule. The Royal Navy was no longer the stop gap to invasion as it was perceived to be in many’s eyes.