The world's eyes are on London, host of the 2012 Summer Olympics. The hosting rights, won under Tony Blair's government slightly more than 7 years ago, are not viewed as enthusiastically by Londoners anymore. It will be anything short of a miracle for the games to proceed without a hitch.
London's international airport, Heathrow, runs at near full capacity most of the year and will be running over capacity when the athletes and spectators begin arriving from everywhere corner of the globe. And it is guaranteed that the London Underground will also be running over capacity. But these are problems that cannot easily be alleviated. Expansion costs to any public transport system or major aviation hubs cost billions of dollars.