The UK has had one of its hottest days on record, with a high of 38.1C recorded - and forecasters are warning it will be hotter still on Tuesday.
A high of 38.1C was recorded in Santon Downham, Suffolk, on Monday, and 37C was exceeded in several places.
The Met Office has issued a red extreme heat warning for Monday and Tuesday in much of England, with temperatures of up to 41C forecast.
The current highest temperature in the UK is 38.7C, in Cambridge in July 2019.
A high of 38.5C was reached in Faversham, Kent, in August 2003, making Monday the third hottest day on record - and the hottest day of the year so far.
Hawarden in Flintshire hit 37.1C, meaning the hottest day on record for Wales according to provisional figures from the Met Office.
Scotland and Northern Ireland also experienced their warmest days of the year so far with 31.3C recorded in Aboyne, Aberdeenshire, and 31.1C in Derrylin, County Fermanagh.
Temperatures above 37C were also recorded in London, Cambridge, Surrey and elsewhere in Suffolk.
Amber warnings are in place across England and Wales, and parts of Scotland.
Peak temperatures are expected on Tuesday afternoon, with Worksop, Nottinghamshire, forecast to see 41C by the Met Office.
The time to do something about this was back in the Clinton days with the Kyoto Protocols but hey, that ship sailed right into an iceberg.