The Met Office has issued a health alert as parts of the UK faced several days and nights of sweltering conditions.
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Highs of up to 31C (87.8F) are expected as temperatures peak across East Anglia and South East England today and tomorrow.
But it is roasting night-time temperatures of at least 20C (68F) in some parts which pose the most threat.
Head of health forecasting at the Met Office Wayne Elliott said: “While there is the possibility of daytime temperatures reaching trigger thresholds, it is the night-time values which are of real concern.
“High humidity and the lack of any breeze could make matters worse for people with underlying health problems.”
The elderly, babies and young children are the most at risk during hot weather spells, so should be regularly checked to make sure they are not suffering.
The Met Office’s heat warning is level two on its four-level warning scale. It relates to how likely temperatures will exceed “threshold” levels that trigger health concerns - typically 30C during the day and 15C at night.
The NHS advises to keep cool by wearing loose cotton clothes, spraying or splashing faces and the backs of necks with cold water several times a day and staying in the coolest rooms of the home as much as possible.