Brits should shut their curtains and drink to survive this weekend’s heat frenzy – but stick to water.
That is the advice of the Met Office as temperatures could hit an all-time June record of 36C over the next 48 hours.
Britain will be hotter than Portugal, the Canary Islands, Cyprus, Jamaica and the Maldives.
While it may be heaven for sun worshippers experts warn it could be hell for the elderly and vulnerable.
They expect the extreme temperatures to trigger a Level 3 Heat Health Alert.
The Met Office advises workers to ditch thick clothing and walk slowly to avoid exhaustion.
It also suggests taking in plenty of fluid – but not booze.
People should shut their curtains to block out the sun – and to look after those who could succumb to such seering heat.
“Look out for others, especially older people, young children and babies and those with underlying health conditions,’’ the weather forecasters advised.
“Close curtains on rooms that face the sun to keep indoor spaces cooler and remember it may be cooler outdoors than indoors.
“Drink plenty of fluids and avoid excess alcohol.
“Dress appropriately for the weather and slow down when it is hot.’’
The highest temperature of the year – 29.5C or 85.1F – was recorded at Northolt in west London.
It surpassed the previous high of 28.2C – 82.76F – recorded at Kew Gardens on Wednesday.
Revellers at Royal Ascot’s Ladies’ Day were “dropping like flies,” according to one first aider who had treated more than 20 people for the effects of heat.
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At least one woman was stretchered out and another racing fan suffered a suspected heart attack.
Others were seen vomiting into bins and one appeared to be sick in his top hat.
Forecasters said that was just a warm-up – and tomorrow could be the hottest June day in the 181 years of records.
The heat warning covers England from midnight tonight (fri) until midnight on Sunday.