Health Secretary Steve Barclay has urged Brits to support friends and family as 40C life-threatening temperatures loom
Daytime temperatures on Saturday are predicted to be around 27C in London, 26C in Cardiff, 23C in Belfast and 21C in Edinburgh.
The UK Health Security Agency has increased its heat health warning from level three to level four - a "national emergency". A Met Office red warning, for Monday and Tuesday, covers an area from London up to Manchester, and up to the Vale of York.Met Office spokesman Grahame Madge said: "If people have vulnerable relatives or neighbours, now is the time to make sure they're putting suitable measures in place to be able to cope with the heat because if the forecast is as we think it will be in the red warning area, then people's lives are at risk.
Some southern schools are also considering closing on these days - and the NEU teaching union issued a statement saying it would support headteachers taking this decision.
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