Approximately 50 firefighters are currently tackling a blaze at a factory in Easton in Lincolnshire, according to Lincolnshire Fire and Rescue Service.
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Fog patches and extensive low cloud at first will steadily lift and clear.
A murky start with mist and fog then gradually clearing, although some eastern coastal districts may remain cloudier.
Isolated showers should die out through the evening to leave a dry remainder of the night.