How does this then deteriorate into accusations of "airspace grabs"? - a ridiculous term that does not exactly suggest reasoned argument or promote the case for the opposition!
It's historical.
In the same way as Stanstead would grab the whole runway and create $350+ fees to kick light airplanes outta there, NATS would grab as much Rule 21 or Class A airspace designed to deliberately exclude VFR flights, and then add a $170+ navigation service charge for an approach into Stanstead.
If it ain't a grab then what is it?