The UK Health Security Agency has issued a level four heat health alert - the highest possible warning - for the first time ever. The alert for England follows the Met Office earlier today issuing its first-ever red level earning of extreme heat on Monday and Tuesday.
Temperatures could break UK records and head over 40C.
Red, or Level 4, means a national heatwave emergency is underway. This is reached when a heatwave is so severe and/or prolonged that its effects extend outside the health and social care system.
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