Naviair is gradually closing Danish airspace today. It is expected a total closure will be in effect as of 18.00 CET today, which also will affect CPH.
Link to map over expected closure of Danish airspace:
http://www.naviair.dk/media/lukning_DK_airspace.pdf
As noted earlier OSL closed at 10.00 CET today:
http://www.osl.no
LHR and STN is expected to close at 13.00 CET today:
http://www.baa.com/
Updated map with expected spread of ash cloud at 8.00, 14.00, 20.00 and 02.00 tomorrow:
http://www.dr.dk/Nyheder/Udland/2010/04/15/105225.htm
It seems that ARN, HEL, AMS and possibly FRA and CDG might be affected late tonight.
What a mess - happy that I can enjoy the sun on my patio today rather than sit and wait at some airport.