The official said he had raised concerns about Heathrow’s electricity supply days before a power outage forced it to shut down. Heathrow disputed the relevance of the official’s comments.

Heathrow Airport was warned about the "resilience" of its power supply in the days before a fire which shut down the airport for more than a day last month. Nigel Wicking, chief executive of Heathrow Airline Operators' Committee,

The Heathrow boss has been questioned over the airport’s handling of a power cut following the huge substation fire. Around 300,000 passengers faced disruption in the UK and abroad when Heathrow Airport closed following an overnight blaze at a nearby substation on March 21.