A crew each Slough and Windsor put out a van fire in Huntercombe Lane North, Burnham, on Saturday.
They were called out at 10am and attended for about an hour.
A man, believed to be in his 40s, was taken to hospital with a serious hand injury.
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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.