Timebased were brought in to launch Omega's giant London 2012 countdown clock in Trafalgar Square. The clock marked exactly 500 days before the start of the 2012 games and steadily counted down the days, hours, minutes and seconds to the big sporting event.

The clock itself was made of steel, and weighed approximately four tonnes. Thousands of members of the public turned up to view the clock being unveiled by four strong Olympians. Lord Sebastian Coe, Boris Johnson, Claire Balding and Jessica Ennis were also present for the live broadcast. As the clock approached the 500 days' mark, Trafalgar Square's fountain erupted, along with fireworks all around the clock. A momentous occasion for the capital.