Soaring temperatures prompted one Aldi store to start rationing the amount of bottled water customers are able to buy.
For a period over the weekend one branch of the budget supermarket was limiting customers to one type of bottled water per person.
A sign warning shoppers was spotted at the Streatham store in South London over the weekend ahead of the scorching weather that kicked off in earnest on Monday morning.
It read: “Maximum 1x type of water per person.”
However, an Aldi spokesperson this afternoon said the restrictions were only in place for a limited period of time.
The restrictions were not widespread across their stores, the spokesperson claimed.
“No restrictions are in place and we have good availability of water in all our stores," they added.
Temperatures are forecast to hit the high 30s over the first two days of this week - with the possibility of the mercury rising to a dangerous 40C in some places.
In parts of the UK today it will be hotter than the Sahara desert.
Scorching summer temperatures have already caused chaos for shoppers across the UK.
In B&M, a viral video showed chocolate bars melting on shelves.
And shoppers have been asked to ensure they wear t-shirts and tops when heading to the supermarket and the pub.
Meanwhile, Iceland invited customers to chill out in its freezer aisles amid the heatwave.
It comes as Brits are being warned to stay indoors as “ferocious” life-threatening ‘day and night’ temperatures are due to blast the UK for the first time in history.
Death-Valley type temperatures of 42C during the day and 30C at night are threatening to double the UK summer average - prompting a Met Office red warning for the first time ever.
The public are being urged “to do as little as possible” and try not to use public transport.
Hospitals have cancelled appointments and many businesses have announced two day closures including restaurants, bars, zoos and wildlife centres - while millions will work from home.
The chief executive of the College of Paramedics has warned that the “ferocious heat” the UK is predicted to experience over the next few days could result in people dying.
She told Sky: “We could see people who are vulnerable, young people, elderly people, people living with dementia who really do suffer.
“This is serious heat that could actually ultimately end in people’s deaths because it is so ferocious. We are just not set up for that sort of heat in this country.
“This isn’t like a lovely hot day where we can put a bit of sunscreen on, go out and enjoy a swim and a meal outside."
Recent figures revealed how one in ten people waited 10 hours for an ambulance and the average waiting times for a heart attack was more than 50 minutes.
