From the BBC:
http://news.bbc.co.uk/2/hi/uk_news/8621407.stm
[/i]Airspace closed:[/i]
UK
Republic of Ireland
Norway
Partial or planned closures:
Sweden (total closure by 2000 GMT)
France (two main Paris airports plus several in the north)
Denmark (total by 1600 GMT)
Finland (northern airspace closed till 1200 GMT Friday)
Belgium (total from 1430 GMT)
Netherlands (being shut progressively)