Harry Styles opened night six of his Wembley Stadium residency by urging concert-goers to look after each other as temperatures soared on Tuesday night.The UK is bracing for its 'hottest day ever' as a heat dome spreading across Europe reaches the country. The Health Security Agency has issued a red health alert warning that there is a 'risk to life for even the healthy population'. Temperatures were forecast to reach 33C in Wembley at 5pm when the doors opened and were expected to remain at a 31C high, as the One Direction star took to the stage at 8.05pm, following support act Shania Twain. Harry arrived on stage for the latest date of his Together Together tour dressed in his signature short shorts, teamed with a matching teal blazer and orange shirt.The singer, who kicked off his record-breaking 12-night Wembley residency on June 12, urged the 80,000 fans present to 'look after each other'.'We're going to look after each other, please try and stay hydrated. If you need anything at any point, please let me know, we can stop at anytime,' he said. Harry Styles opened his latest Wembley Stadium gig by urging concert-goers to look after each as temperatures soared on Tuesday night'It's all good. We're gonna look after each other, have fun, dance, get sweaty, sing, scream if you wanna go faster.' Wembley Stadium relaxed its water bottle policy on Tuesday to allow concertgoers to bring metal or hard plastic water bottles inside.They also advertised half-priced water available for sale inside whilst free sun cream was available from information points. A red weather warning has been issued across the country for Wednesday and Thursday, with temperatures due to come close to Britain's all-time record of 40.3C, set in July 2022. Some schools have cancelled trips and are setting work for students to do at home, after the Met Office warned the heatwave is expected to bring 'severe and significant impacts', including widespread health risks for many. Meanwhile the Army has cancelled ceremonial operations in London and Windsor to protect the 'wellbeing' of its soldiers, and lidos are already fully booked for the week ahead. Extreme heat is also expected to cause travel disruption tomorrow with train services across Kent and south-east London likely to be affected, South Eastern Railway said. The rail operator urged passengers to only travel if 'absolutely necessary'.The highest temperature recorded in the UK on Tuesday was 34.6C in Wisley in Surrey, the Met Office has said.Scotland and Northern Ireland recorded their hottest days of the year so far with the mercury hitting 28.8C in Fyvie Castle, Aberdeenshire, and 26.4C in Katesbridge, County Down. The singer, who kicked off his record-breaking 12-night Wembley residency on June 12, urged the 80,000 fans present to 'look after each other' Videos shared by Wembley Stadium showed water mist being sprayed over the crowd before the concert kicked off Temperatures were forecast to reach 33C in Wembley at 5pm when the doors opened and were expected to remain at a 31C high, as the One Direction star took to the stage at 8.05pm