Not too long ago the Manston ATCOs were given a massive pay hike which put them on comparable rates if not greater than a lot of non NATS airports.
A few of them applied to us saying they'd be willing to move if they were "employed on better terms and conditions".
I imagine that the very same letters were sent to many other places in the UK.
If they came to us they would do so on our terms, not theirs, and I imagine the same would apply elsewhere.
Whilst I sincerely hope that Manston keeps going as an airport and everyone keeps their jobs, if you want to move, the above still applies, (even within NATS).