Originally Posted by
BroomstickPilot
I should say, definitely not.
The essential thing about an eruption is that it is UNPEDICTABLE.
And as such, it would be very wise not to be within say 150 miles downwind and 50 miles other directions as it might beltch up a think cloud ... but this cloud needs to disperse, and over a moderately long distance it is going to be the wind (predictable) and diffusion (slow). You are not going to be surprised by a sudden cloud of ash over Surrey!