A crucial 100 days for London's Olympics

London's 2012 organisers have just 100 days to prepare for the biggest logistical peacetime exercise Britain has seen. Not to mention the arrival of 10,500 athletes, 21,000 media people and 8.8 million ticket-holders.

The milestone will be greeted with the usual photo opportunities, platitudes and mind-boggling statistics; the PR stunts from sponsors who have invested hundreds of millions in the Games will increase; questions about what taxpayers get for their £9.3 billion will get louder, as will government drum-banging about the benefits - all underscored by new urgency as the scale hits home.