and for what its worth, the VAAC have access to more satellite products than just that Metsat RGB dust image which is being used by the media to indicate the extent of the ash.
There are more ash based images available, which to an untrained eye indicate small areas of something over west Scotland and NW England, which, based on the description on the website, indicate ash.
Met Office: Iceland Volcano satellite imagery
Grímsvötn volcanic ash observations - Met Office
Might not be the massive uninterrupted ash cloud which I would imagine some people have in their minds, but indicates patchy concentrations of ash extending well beyond that of the main band off to the north and east of Aberdeen.