We've spent £9 billion paying for the London 2012 Olympics. The organisers say London 2012 will be an accessible and affordable Games, leaving a lasting sporting legacy. But 1.8 million British people applied for tickets in the public ballot - over a million applied for the 100 metres final alone - and the vast majority were disappointed. So who got the tickets and for what events? Antony Barnett investigates in this Dispatches Special.