Almost a quarter of a million people applied to be one of the 70,000 strong army of volunteers that have powered London's Olympics. Daniel Garrahan speaks to a group of volunteers that work for free, helping spectators with directions and whipping up crowds on their way to events.<br /><br />For more in depth FT coverage of the 2012 Olympic Games in London go to: http://www.ft.com/intl/london-2012-olympics
