Fire that shut Heathrow Airport caused by technical fault known for years, report says
Europe's busiest air hub was shut down for around 18 hours on 21 March after a fire at the North Hyde substation in west London knocked out power to the airport.
Europe's busiest air hub was shut down for around 18 hours on 21 March after a fire at the North Hyde substation in west London knocked out power to the airport.
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