Sunfish: my holiday plans are not affected.
However, if the politicians have - as you suggest - scientifically significant data showing the ash concentration at various FLs across Europe, why do we not know about it?
All else is a knee-jerk reaction to a perceived threat. The correct measure is to ascertain whether the perception is backed up by hard facts. That is not being done anywhere in Europe - except through private initiative.
That air space might be initially closed while we are waiting for results from statistically sound sampling is OK. However, I repeat, there is NO sampling going on that we know about.