Air traffic control company Nats said it is restricting the number of aircraft flying across the south of England and those taking off from airports due to technical problems at its Swanwick control centre in Hampshire.
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The Labour politicians put their alleged differences aside to jointly highlight how remaining in the EU could help fight climate change.
Late sunshine here and there this evening - but more cloud for southern Scotland, northern England and Northern Ireland again.
Pro-Leave campaigner Boris Johnson has responded in a politely worded letter to Jean-Claude Juncker's invitation to "come back to Brussels".