Just off the beeb's live feed....
Government sources tell the BBC they are questioning assertions from Ryanair boss Michael O'Leary
A source told the BBC the plane did not go through the "red zone", where ash is at its most dense, and did not have measuring equipment on board. Radar tracked the plane which was travelling at 41,000ft.
Aviation regulator CAA confirms that at "no time did a Ryanair flight enter the notified area of high contamination ash over Scotland this morning".
A CAA spokesman adds: "Aircraft engines coming into contact with volcanic ash can have catastrophic consequences. That's why there are comprehensive safety arrangements in place."
Edit : Beaten to it!