A red extreme heart warning has been issued for the first time by the UK Met Office for parts of England, meaning a risk to life is likely as temperatures could hit 40C (104F).
It points to there being a danger to life, with the risk of illness not limited to vulnerable people.
In Europe, the heatwave is fuelling wildfires in Portugal, France and Spain.
Experts say heatwaves are becoming more frequent and extreme because of climate change.
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