One of the critical questions being asked is how one power sub-station has forced the closure of one of the largest international airports in the world.
And what does the Heathrow incident tell us about the vulnerability of UK infrastructure?
Sky’s Data and Forensics correspondent Tom Cheshire has this analysis.
Live updates: https://news.sky.com/story/large-fire-at-electrical-substation-in-west-london-causes-power-outages-13332920
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