Here is an interesting snippet from The Clare Herald dated 21st May 2010:
“An eruption of Katla volcano has the potential to be more devastating than the current eruption of Eyjafjallajokull. Geophysicists at Iceland’s Institute of Earth Sciences say Katla would be locally and globally damaging.
Icelandic President Ólafur Grímsson has warned Governments around Europe that a significant eruption at the volcano is ‘coming close’. He said: “We [Iceland] have prepared … it is high time for European governments and airline authorities all over Europe and the world to start planning for the eventual Katla eruption”.
So be prepared for more disruption to travel across Europe in the coming months (years?) :'(