People expecting to fly in and out of Bristol Airport today are facing delays.
Air traffic control company Nats has said it is restricting aircraft flying across the south of England due to technical problems at its Swanwick control centre in Hampshire.
Passengers are advised to check in as normal but expect delays.
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The Post Office said it was 'business as usual' but unions said Saturday's industrial action was getting solid support.
Workers and managers are to stage another strike on Saturday amid a long-running dispute over jobs, pensions and closures.
Cloudy in the West with a few showers. Sunny in the East but cold.