The previous record was 38.7C (101.7F), set in 2019 at Cambridge Botanic Garden
Rail users have been warned of delays and cancellations as the heat takes its toll on the country's infrastructure.
There will be no Thameslink or Great Northern trains running in any location north of London, from London Blackfriars via St Pancras, or from London King's Cross or London Moorgate. Merseyrail said the number of trains running and journey times will be"seriously affected" and some routes closed completely.Please use Chrome browser for a more accessible video playerSouthern, Southeastern, South Western Railway and Great Western Railway are among the dozens of train companies running significantly reduced services across the country.
Transport for London said London's rail network would also be running a reduced service due to safety restrictions put into place to deal with the heat.Rachel Ayers, a Met Office forecaster, says Tuesday will be"a pretty unprecedented day", with temperatures possibly reaching highs of 41C in spots in England.
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