and the NATS reply raises all kinds of questions about further extensions to the "trials"
And here's the CAA letter referred to in the reply from NATS:
http://www.caa.co.uk/docs/589/201201...%20meeting.pdf
Interesting reference (2nd para) to:
"Plans are already being formulated to stand up the NACME [National Airspace Crisis Management Executive] for some of the peak capacity days as a precaution."