The fire that caused a hugely disruptive shutdown at Heathrow airport in March was likely caused by the failure of a component at an electricity substation, Britain's National Energy System Operator said in a report on the incident on Wednesday.

National Grid blamed for 'catastrophic failure' that led to Heathrow substation fire, report reveals - Moisture in the oil at the substation was detected by National Grid as long ago at 2018 but was n

Heathrow Airport is considering taking legal action against National Grid after a report found the substation fire which caused the airport to shut down earlier this year was the result of a known fault.