Several hospitals across the UK have declared critical incidents as they deal with the heatwave. Sky's Ashish Joshi looks at what a critical incident is and what it means for hospitals. Follow live: https://news.sky.com/story/heatwave-latest-amber-weather-warnings-for-extreme-heat-come-into-force-13555802 #skynews #uknews #nhs #heatwave #extremeweather SUBSCRIBE to our YouTube channel for more videos: http://www.youtube.com/skynews Follow us on Twitter: https://twitter.com/skynews Like us on Facebook: https://www.facebook.com/skynews Follow us on Instagram: https://www.instagram.com/skynews Follow us on TikTok: https://www.tiktok.com/@skynews For more content go to http://news.sky.com and download our apps: Apple https://itunes.apple.com/gb/app/sky-news/id316391924?mt=8 Android https://play.google.com/store/apps/details?id=com.bskyb.skynews.android&hl=en_GB Listen to our new podcast This is Why, available for free here: https://podfollow.com/thisiswhy To enquire about licensing Sky News content, you can find more information here: https://news.sky.com/info/library-sales