B*lls**t
it is a complete and utter load of B*lls**t from start to finish of this whole farce, and you can argue all you want about the should fly shouldn't fly crap from behind a desk, but until the CAA put a plane up and give proof of ash concentration then all the rest is hypothetical horse manure.
And for those of you interested in when it will be over, if the cloud even looks like it's approaching Heathrow or the CAA think about shutting UK airspace, then WW and a few others will see to it that it is over.