Transport Secretary Heidi Alexander has vowed it is time to "learn lessons" after a huge fire broke out near Heathrow Airport last week.

Heathrow defended its decision to shut down following claims that it did have enough power to operate after the substation fire.

Speaking in the Commons today, Alexander said: " I also want to thank the firefighters and emergency responders who worked in very difficult conditions to put the fire out, as well as Heathrow, the National Grid and all other public services involved who worked so hard to get power back on and people back traveling again.

"This was an unprecedented event, and we must learn any and all lessons we can to ensure that it does not reoccur in future."