Sky's Tom Clarke explains what caused the substation fire that brought Heathrow Airport to a standstill, as well as the "serious questions" around the maintenance of National Grid assets. #heathrow SUBSCRIBE to our YouTube channel for more videos: http://www.youtube.com/skynews Follow us on Twitter: https://twitter.com/skynews Like us on Facebook: https://www.facebook.com/skynews Follow us on Instagram: https://www.instagram.com/skynews Follow us on TikTok: https://www.tiktok.com/@skynews For

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