Hi Slip and Turn. I wonder if you might share with us your experience in this matter? I know it's a public forum and you're most welcome to post but since this is a NATS specific issue I wonder what your interest is?
It's just I remember your posts being less than welcome in the "BA emergency descent" and the 'BBC reports Heathrow operation unsafe' threads.
Please forgive me if my request is out of order I'm just concerned you may muddy the waters if you are neither a NATS employee or an ATCO.