Heathrow bosses 'were warned of potential substation failures DAYS before power outage closed airport'
Nigel Wicking, the chief executive of Heathrow Airline Operators' Committee, told MPs there were a 'couple of incidents' which made him concerned.
Nigel Wicking, the chief executive of Heathrow Airline Operators' Committee, told MPs there were a 'couple of incidents' which made him concerned.
