Heathrow Airport site has the following message:
https://www.heathrow.com/
Quote:
Heathrow closure - Friday 21 Mar 2025
Due to a fire at an electrical substation supplying the airport, Heathrow is experiencing a significant power outage.
To maintain the safety of our passengers and colleagues, Heathrow will be closed until 23:59 on 21 March.
Passengers are advised not to travel to the airport and should contact their airline for further information. We apologise for the inconvenience.
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