Listening to Adonis on Radion 4 - seems to be some back-tracking and damage limitation (of the completely over the top knee jerk reaction) going on.
My opinion - unscientific as it is - (but it would appear no more unscientific than the 'authorities' one), is that the bird that flew over my house this morning constitutes a far greater hazard to aviation than the tiny concentration of ash particulates in the same sky. Don't know why MODs deleted my post putting that point across?
Feel free to prove that I'm wrong