Thousands of air passengers were delayed at Heathrow tonight after technical problems with the air traffic system stopped flights leaving the airport.
The computer glitch means passengers have faced delays which are now easing.
Currently some flights are an hour late. Services should be normal in the morning. National Air Traffic Services has just issued the following statement.
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A poisonous dust cloud that can trigger breathing problems is heading our way - just as we look forward to the expected heatwave.
Friday morning's forecast for the west of the region
Friday morning's forecast for the east of the region