Olympic Rings are revealed during an unveiling ceremony in the Terminal Five arrivals hall at Heathrow Airport, in preparation for the London 2012 Olympic Games in London June 20, 2012. [Photo/Agencies]

Olympic mascot Wenlock poses for a photograph with Garrison Sargeant Major William Mott of the Welsh Guards during an Olympic Rings unveiling ceremony in the Terminal Five arrivals hall at Heathrow Airport, in preparation for the London 2012 Olympic Games in London June 20, 2012. [Photo/Agencies]

Air crew pass the newly unveiled Olympic Rings in preparation for the London 2012 Olympic Games, in the Terminal Five arrivals hall at Heathrow Airport in London June 20, 2012. [Photo/Agencies]

Bandsmen of the Irish Guards play during an unveiling ceremony for Olympic Rings in the Terminal Five arrivals hall at Heathrow Airport, in preparation for the London 2012 Olympic Games in London June 20, 2012. [Photo/Agencies]

A traveller passes the Olympic Rings during an unveiling ceremony in the Terminal Five arrivals hall at Heathrow Airport, in preparation for the London 2012 Olympic Games in London June 20, 2012. [Photo/Agencies]

The CEO of the London Organising Committee of the Olympic and Paralympic Games (LOCOG), Paul Deighton, speaks during an interview at an unveiling ceremony for Olympic Rings in the Terminal Five arrivals hall at Heathrow Airport, in preparation for the London 2012 Olympic Games in London June 20, 2012. [Photo/Agencies]

Olympic Rings are revealed during an unveiling ceremony in the Terminal Five arrivals hall at Heathrow Airport, in preparation for the London 2012 Olympic Games in London June 20, 2012. [Photo/Agencies]

Olympic Rings are revealed during an unveiling ceremony in the Terminal Five arrivals hall at Heathrow Airport, in preparation for the London 2012 Olympic Games in London June 20, 2012.