UK MPs have been grilling company representatives involved in the response to a Heathrow Airport power outage that saw flight operations grind to a standstill.

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 faced severe disruptions on 21 March after a power substation fire led to a near 24-hour shutdown, impacting over 250,000 passengers. Airlines had warned Heathrow about vulnerabilities in its power supply days before the incident,