Tocamak, you should be aware that Airclues is exactly the sort of person who has related experience and responsibility!
I did remove the second paragraph as it was a bit strong. However there is a huge difference between having the experience and good sense in avoiding an isolated and visible ash plume and having the responsibility for the whole of UK airspace in this quite diffeent scenario. If any of us were at the threshold ready for departure and given the choice "Well it's up to you mate" would we really have any option. I do admit it is really difficult to see the threat and there is always the feeling that current society overeacts to any risk. I doubt if the airlines themselves are just taking this without seeking to get the justification from the relevant authorities in the countries affected.