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.

The boss of Heathrow Airport has apologised to the over 200,000 passengers whose journeys were disrupted by its closure last month following a fire. Thomas Woldbye offered his "deepest regrets" adding that the "situation was unprecedented". Speaking to MPs, he said he recognised "the considerable inconvenience and concern it caused".

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.