Parts of the England and Wales are expected to reach at least 20C over the coming days - five degrees above average - as warm southern winds stave off an autumnal chill.
Virtually all parts of the UK will bask in the Indian summer conditions, with the mercury expected to reach 17 degrees as far north as Glasgow.
The heatwave will make the week one of the warmest for late October on record. The highest temperature for this time of the year stopped just short of 23 degrees in 1996.
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