For people travelling...or not, here is the latest for the UK based on the latest Met Office information:
Part of Scottish airspace including Aberdeen, Inverness and Edinburgh airports will continue to be available from 1300-1900 today, and also south to Newcastle Airport. Restrictions will remain in place over the rest of UK airspace below 20,000ft.
Overnight the CAA, in line with new guidance from the International Civil Aviation Organisation (ICAO) decided flights above the ash cloud will be permitted in the UK; between 1300-1900 this will enable aircraft movements above 20,000ft in UK airspace.
NATS will continue to monitor Met Office information and the situation is likely to change overnight. NATS will make a further statement at approximately 1500 (UK time) today, Tuesday 20 April.