Britain is experiencing its hottest days today and tomorrow

Britain is witnessing its hottest day since records began, with temperatures expected to reach 40 degrees Celsius for the first time, forcing train companies to cancel some services and prompting health authorities to deploy more ambulances.

Most of Europe is witnessing a severe heat wave, with temperatures reaching about 45 degrees Celsius in some areas, and forest fires have spread to Portugal, Spain and France.

Britain declared a national emergency after forecasts indicated that temperatures will exceed the 38.7 degrees Celsius mark recorded in Cambridge University Park in 2019.

The London Underground imposed temporary speed restrictions on the train network today and tomorrow, which means that flights are reduced with the length of the journey due to the reduction in speed.

The national railway company advised passengers to stay at home and said some services, including a major line between north-east England and London, would not operate at certain times on Tuesday.

Some schools will close early today.

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