The Luton airport website reports: "Owing to technical issues with Air Traffic Control, flights in or out of London Luton Airport may be affected.
"Passengers are advised to check in for their flights as normal."
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It will be a largely cloudy but humid day with the risk of hit-and-miss heavy showers and thunderstorms.
It will turn dull and misty again overnight but it will stay mild. Tomorrow will be mostly cloudy with a risk of localised heavy showers.
Group Lotus has announced plans to shed over 300 jobs in a restructuring and cost-cutting move.