why is it that the crabs fail to understand that the absolute crux of the FI defence is air power?
Air power is certainly important
They don't need to invade
That's probably correct
They just need to close the airhead to incoming traffic. we would be unable to use ships to get supplies in once air cover is gone - submarines won't be much use in that little tussle. once the FI is unsuppliable then we'll simply have to 'negotiate'. it will be over.
If it reaches the stage where the "Enemy" is threatening to sink one or two supply ships then the British need to threaten to sink lots of the "Enemy's" ships. SSNs are efficient at sinking ships