Two other substations available to supply airport with electricity, according to chief executive John PettigrewThere was enough power for Heathrow to remain open during the entire period it was shut down on Friday, the head of National Grid has said.Speaking for the first time since a fire forced North Hyde substation to close, the National Grid chief executive, John Pettigrew, said two other substations that serve Heathrow were working and could have supplied the airport with all the power it needed to remain open. Continue reading...