Classic Wings,
yes, many years at four different ones and I am still at one.
I wasn't putting regional airports down, it's just that NATS do offer better salaries and more opportunities to progress (if that's what you want to do) without having to wait for someone to move on or drop dead.
I enjoy working where I am, but I wasn't NATS trained and I've had to move around a bit to get the opportunities I have.