I have been following the NATS news page closely since this all started and this afternoon I detect a shift in what they are saying.
IMHO they over-reacted and now need to climb down and save face.
Now they are using words like 'dynamic' and 'We are working closely with Government, airports and airlines, and airframe and aero engine manufacturers to get a better understanding of the effects of the ash cloud and to seek solutions.' I bet it will all be over by tomorrow and a statement along the lines of ' after extensive testing and in consultation with enging manufactures etc etc...the ban will be lifted from ??:??hrs
I hope I'm right.