Stay up to date with notifications from The IndependentNotifications can be managed in browser preferences.AllNewsSportCultureLifestyleThe London Ambulance Service recorded its highest ever number of life-threatening emergencies on Wednesday. The unprecedented demand was attributed to the “extreme heat” affecting the capital. It responded to 642 category one calls, which include the most serious and life-threatening incidents. More than 400 additional ambulance crews have been deployed amid the heatwave, the London Ambulance Service said earlier. Chief executive Jason Killens KAM said: “Our crews are working very hard in challenging conditions to care for patients and I would like to take this opportunity to thank all our people for their incredible hard work.”In fullUK heatwave live: Hottest June day on record broken again as Met Office extends ‘extreme heat’ red weather warningMore bulletinsThank you for registeringPlease refresh the page or navigate to another page on the site to be automatically logged inPlease refresh your browser to be logged in

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