Latest update from NATS....
Statement on Icelandic volcanic eruption: Sunday April 18, 1500
Conditions around the movement of the layers of the volcanic ash cloud over the UK remain dynamic. NATS is maintaining close dialogue with the Met Office and with the UK’s safety regulator, the CAA, in respect of the international civil aviation policy we follow in applying restrictions to use of airspace. We are currently awaiting CAA guidance.
We are working closely with Government, airports and airlines, and airframe and aero engine manufacturers to get a better understanding of the effects of the ash cloud and to seek solutions.
Based on the latest information from the Met Office, NATS advises that the restrictions currently in place across UK controlled airspace will remain in place until at least 0700 (local time) tomorrow, Monday 19 April.
We will of course continue to make best use of any breaks in the ash cloud to offer opportunities to airlines as they arise.