Easyjet A321 - exactly!
Nobody is going to send off L/H flights because there is an unpredictable window within an ash cloud, it is too unpredictable. Same goes for S/H, the airlines are hardly going to keep pax for days on end at an airport just in case a narrow window opens. The logistics alone are a nightmare.
It wouldn't matter what MAN does, the flights haven't left their bases, there is the best part of sweet FA airborne, and nothing to land here anyway.