Aviation authorities are continuing to monitor the situation in Iceland after the country issued a red alert over a possible volcanic eruption.
Iceland's Met Office has warned that an eruption has taken place under the ice of Europe's largest glacier.
Seismic activity is continuing at the Bardarbunga volcano, about 30km away.
Iceland has closed the airspace over Bardarbunga volcano but all general airports in the country remain open.
The red alert means "eruption is imminent" with "significant emission of volcanic ash likely".
The UK Civil Aviation Authority (CAA) said there would be no impact on flights unless there was an actual eruption.
A Met Office spokeswoman said: "We are in close contact with the Icelandic Met Office, but currently they tell us that the eruptions are sub-glacial, so no ash has made it to the surface.
"If ash does make it to the surface, we will run our model which will indicate where any ash would go, and we will inform the CAA and NATS.
"They will then make the decision on how that will affect any air flights."
British Airways said it was keeping the situation "under close observation", but that its flights were continuing to operate normally for now.
In 2010 much of Europe’s airspace was shut for six days, affecting more than 10 million people, after Iceland’s Eyjafjallajokull volcano erupted.
After the ash report published