BoughtTheFarm
The problem is the MET office do not have the equipment to accurately model the movement of content/density of the ash and cannot predict it's effects on aircraft systems which is why we need to get more test aircraft up there.
Someone mentioned that a some measurements had been made and we were not referring to the fact they found dangerous levels of ash at some levels. The question is dangerous to what? What are they basing this assertion on? The aircraft making the measurements returned safely. Was it inspected? Did it suffer damage? Apparently not.
Data, hard data not hysterics and over reaction!