A power outage forced Heathrow to close for much of Friday, resulting in major disruption for passengers flying to and from Europe's busiest airport.The power loss was caused by a blaze at an electricity substation in Hayes, west London, late on Thursday.

A power outage forced Heathrow to close for much of Friday, resulting in major disruption for passengers flying to and from Europe's busiest airport.The power loss was caused by a blaze at an electricity substation in Hayes, west London, late on Thursday.