Forecasters have warned that parts of the country could see mid-30s temperatures in the middle of this week. UK heatwave coming this week as Met Office warning issuedTom Morgan, meteorologist at the Met Office, said: "We’ll probably see highs reaching the mid-30s quite widely on Wednesday, and indeed on Thursday too for England and Wales. Rare red warning could be issued by Met OfficeThe UK Health Security Agency has issued yellow heat health alerts for the East Midlands, West Midlands, South East, South West, East of England, Yorkshire and the Humber, and London. The Met Office is considering issuing amber or red extreme heat warnings, last used during June’s heatwave. The Environment Agency has confirmed that more than 25 million people are facing water use restrictions, including hosepipe bans for all South East Water and Thames Water customers.