The Met Office has issued a severe weather warning for tonight due to heavy fog which has descended on the south east of England.
Experts believe the fog could become more extensive this evening.
The public are warned to take extra care when driving in affected areas.
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The Met Office has issued a yellow alert for Windsor and Maidenhead, Slough and Wokingham, warning that rain moving eastwards across the south of the country may turn to snow in some places.