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A new ash cloud spreading towards the UK is causing uncertainty over plans to reopen some airspace on Tuesday, air traffic control body Nats has said.Earlier, it had announced restrictions would be lifted in Scotland, Northern Ireland and the north of England.
But fresh Met Office information showed the situation was worsening in some areas, said Nats.
Scottish airports are still expected to reopen from 0700 BST, but Nats said it would report again at 0300.
A further update will be made at 0900 BST on Tuesday.
Nats said more airspace over England was expected to become available from 1300 BST although not as far south as London's main airports.
In a statement, Nats said: "The volcano eruption in Iceland has strengthened and a new ash cloud is spreading south and east towards the UK.
"This demonstrates the dynamic and rapidly changing conditions in which we are working."
It said it expected the situation to change overnight, and pointed out it was working closely with the Met Office and the UK's safety regulator, the Civil Aviation Authority.This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.