Heathrow shut down after electrical fire: the experts explain

More than 1,300 flights around the world have been affected when a fire at an electrical substation caused Heathrow Airport to close late yesterday evening (Thursday 20 March).
The UK’s busiest airport shut after the blaze at the North Hyde substation in Hayes, west London. With the airport closed until at least midnight tonight (21 March), and passengers across the globe wondering what caused the disruption and how long it will persist for, engineering experts from the Institution of Engi