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.

Airlines warned Heathrow airport about concerns over the resilience of its electricity supply days before a power outage caused the closure of the UK’s busiest airport and hundreds of cancelled flights,

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.