How many people does it take to change a light bulb in the roof inside Heathrow airport's Terminal 5? Nobody really knows because it has never been done.  The departures concourse of the £4.3 billion terminal, which was designed by British architect Lord Richard Rogers, has become increasingly dark since it opened in 2008 as 60 per cent of the down lights fitted to the ceiling have blown.

But none have been replaced yet because of an incredible oversight meaning there is no safe and easy way to get up to change the bulbs

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