LONDON, ENGLAND - AUGUST 24: Prime Minister David Cameron (R) stands with London Mayor Boris Johnson as the Olympic cauldron is lit for the Paralympic Games in Trafalgar Square on August 24, 2012 in ... more 

LONDON, ENGLAND - AUGUST 24: Prime Minister David Cameron (R) stands with London Mayor Boris Johnson as the Olympic cauldron is lit for the Paralympic Games in Trafalgar Square on August 24, 2012 in London, England. The London 2012 Paralympic Games open on August 29, 2012 for 12 days. (Photo by Peter Macdiarmid/Getty Images) less