An inquiry has found that an electrical substation fire that shut down Heathrow Airport in March was caused by a preventable technical fault identified almost seven years earlier.

A report into a fire that resulted in Heathrow Airport shutting down for nearly a day has been released - what are the key findings?

HEATHROW may sue the National Grid after a probe found a fault causing the huge substation fire was identified seven years ago. The blaze in March halted flights for 24 hours — affecting 270,000