How years of inaction caused a total Heathrow shutdown

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Heathrow Airport is considering legal action against National Grid after a report found the fire which caused the airport to shut down was a result of a known fault at an electrical substation. An investigation found that National Grid, which owns the substation which supplies Heathrow, had been aware of a problem since 2018 but failed to fix it. What went wrong? Who was to blame? And what's needs to be put into place to stop something like this happening again? BBC Radio London's Ross Ryan has been finding out. (Image credit: Getty Images)