What is set to be a record-breaking heatwave has already caused disruption across the UK, with school closures, disrupted travel and stretched emergency services. Met Office chief executive Penelope Endersby says there is a 60% chance that temperatures could climb to over 40C in the next 48 hours which, she says, is "unheard of". Report by Lewisl. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn