UK supermarkets, including major chains, have faced significant challenges during the recent back-to-back heatwaves, which have put a strain on infrastructure.
Mark & Spencer has announced plans to reinvest in systems designed to withstand extreme temperatures, following last month's heatwave during which some of the supermarket's fridges broke down.
The supermarket's chief executive stated that the company was struggling during the nine days of extreme heat and is now investing in equipment that can handle temperatures of 45 degrees.
The UK could regularly experience peak temperatures of 45C by 2056, according to scientists.
London is expected to endure the worst of the July heatwave, with temperatures projected to reach 34C and possibly above later this week.
The Met Office has issued an amber heat health alert, covering London, the South East and West, East of England, and the Midlands from Wednesday morning until Sunday evening.
Nighttime temperatures in urban areas are likely to remain in the high teens Celsius overnight, spelling tropical nights.
Rainfall has been scarce across the UK for weeks, increasing the risk of wildfires and putting pressure on water supplies.
Water companies have taken action in the worst-affected areas in the south, prompting Londoners to avoid using hosepipes and Thames Water to plead its customers to do the same.
South East Water has introduced an official hosepipe ban in parts of Kent, while Southern Water's ban will start across Hampshire and the Isle of Wight from July 10.
Using a hosepipe in a banned zone can result in a £1,000 fine.
