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Story summary
- The Met Office issued a rare red heat warning for June 24-25, only the second time the warning has been used.
- Scientists say a 1976-style UK heatwave would now last 15 days above 35 °C, about three degrees hotter than the 1976 event.
- More than 300 schools planned partial or full closures on June 23 as the heat warning took effect.
- Network Rail advised passengers to travel only if necessary.
