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The UK has hit its hottest temperature on record, with a temperature of 40.2C recorded at Heathrow in London
Network Rail has issued a "do not travel" warning for parts of the country.
Temperatures could reach up to 42C today
UK temperatures top 40C, provisional Met Office data suggests.
Temperatures in the UK have climbed above 40C at Heathrow airport for the first time ever, according to early Met Office data.
Temperatures could reach up to 42C today, forecasters say, with serious implications for people's health.
The extreme heat is fuelled by climate change which is making every heatwave more intense, frequent and likely, scientists warn.
Network Rail has issued a "do not travel" warning for parts of the country.
The UK's first ever red warning for heat is in place across much of England, and people are being urged to stay cool and hydrated