Heathrow and Gatwick flight cancellations leave ‘40,000 stranded’ after thunderstorms

The heatwave has turned into stormy weather, causing chaos at London airports (Picture: AFP via Getty Images)Severe thunderstorms have caused chaos at Britain’s busiest airports, delaying more than 900 flights and forcing dozens of cancellations.More than 474 flights at London Heathrow and 439 at Gatwick were delayed, with some disruptions lasting for up to 11 hours, according to flight tracking data.One British Airways service from Santiago, Chile, scheduled to arrive at Heathrow at 10am