Revellers stand on Tower Bridge by the river Thames to see the Olympic flame on the final day of the Olympic torch relay where it will end in the London Olympic Stadium for the opening ceremony of the 2012 London Olympics, on July 27, 2012. AFP PHOTO/ANDREW COWIE

The Olympic Torch sails down the Thames on the Gloriana during the 2012 London Olympic Games Torch Relay on July 27, 2012 in London. The Olympic Flame is now its final day of its 70-day relay which will see the flame taken to the Olympic Park for the opening ceremony tonight. AFP PHOTO/WILL OLIVER

Torchbearer 001 Rosie Hynes carries the Olympic Flame on the Torch Relay leg between Bushy Park and Hampton Court. Image credit: LOCOG / eyevine

In this photo provided by LOCOG, Bollywood actor Amitabh Bachchan carries the Olympic flame on the torch relay leg between The City of London and the borough of Southwark in London, Thursday, July 25, 2012. (AP Photo/LOCOG, Yui Mok)

Torchbearer Kevin Crain, carries the Olympic Flame as he arrives at St. Paul's Cathedral, in central London, ahead of the 2012 Summer Olympics, Thursday, July 26, 2012, The Olympic Torch is being carried around London in the final stages of a relay of torchbearers to make its way to the London 2012 Olympic Games opening ceremony on July 27, 2012. (AP Photo/Lefteris Pitarakis)

In this photo provided by LOCOG, Daniel Mccubbin holds the Olympic Flame inside St Pancras International Railway Station on Day 69 of the London 2012 Olympic Torch Relay, Thursday July 26, 2012, in London. (AP Photo/LOCOG, Gareth Fuller)

A member of the U.S. military poses for a photo next to the Olympic torch on Thursday, July 26, 2012, prior to the flag raising ceremony for the United States at the Olympic village in London, one day before the start of the London 2012 Summer Olympics. (AP Photo/Emilio Morenatti)

In this photo provided by LOCOG, British actresses and torchbearers Joanna Lumley, center right, and Jennifer Saunders, center left, carry the Olympic Flame on the Torch Relay leg between Lambeth and Kensington and Chelsea, in London, Thursday, July 26, 2012. The opening ceremonies for the 2012 Summer Olympics will be held Friday, July 27. (AP Photo/LOCOG,Gareth Fuller)

Torchbearer Darren Fitzpatrick carries the Olympic Flame through the streets of Camden in London, ahead of the 2012 Summer Olympics, Thursday, July 26, 2012, The Olympic Torch was carried around England in a relay of torchbearers to make its way to the opening ceremony on Friday. (AP Photo/Lefteris Pitarakis)

In this photo provided by LOCOG, British actresses and torchbearers Joanna Lumley, center right, and Jennifer Saunders, center left, carry the Olympic Flame on the Torch Relay leg between Lambeth and Kensington and Chelsea, in London, Thursday, July 26, 2012. The opening ceremonies for the 2012 Summer Olympics will be held Friday, July 27. (AP Photo/LOCOG,Gareth Fuller)

In this photo provided by LOCOG, Bollywood actor Amitabh Bachchan carries the Olympic flame on the torch relay leg between The City of London and the borough of Southwark in London, Thursday, July 25, 2012. (AP Photo/LOCOG, Yui Mok)

Tyler Rix Coca Cola Olympic Torch Relay Finale - the final torchbearer arrives to light the cauldron - at Hyde Park, London, England. July 26th 2012 half length white t-shirt arm in air side profile mouth open fire flame CAP/ROS Steve Ross/Capital Pictures

Tyler Rix & Boris Johnson Coca Cola Olympic Torch Relay Finale - the final torchbearer arrives to light the cauldron - at Hyde Park, London, England. July 26th 2012 half length black suit full 3/4 white top trousers arm over shoulder CAP/ROS Steve Ross/Capital Pictures

Olympic torch arrives at Downing Street. Kate Nesbit, who was injured in Afghanistan and was the first woman to be awarded the Military Cross with Prime Minister David Cameron and his wife Samantha on the steps of number 10 Downing Street. ? Lucy Young / eyevine

LONDON- ENGLAND- 26-JULY-2012- Britain's Duke and Duchess of Cambridge with Prince Harry receive the Olympic Torch at Buckingham Palace on it's route around Britain to the Olympic Stadium for the Opening of the 2012 London Olympic Games tomorrow.

LONDON- ENGLAND- 26-JULY-2012- Britain's Duke and Duchess of Cambridge with Prince Harry receive the Olympic Torch at Buckingham Palace on it's route around Britain to the Olympic Stadium for the Opening of the 2012 London Olympic Games tomorrow.

LONDON- ENGLAND- 26-JULY-2012- Britain's Duke and Duchess of Cambridge with Prince Harry receive the Olympic Torch at Buckingham Palace on it's route around Britain to the Olympic Stadium for the Opening of the 2012 London Olympic Games tomorrow.

Olympic torch at Downing Street. Florence Rowe, 81, takes the torch from downing street and has her picture taken by family with Prime Minister David Cameron and his wife Samantha. ? Lucy Young / eyevine

Olympic torch arrives at Downing Street. Kate Nesbit, who was injured in Afghanistan and was the first woman to be awarded the Military Cross with Prime Minister David Cameron and his wife Samantha on the steps of number 10 Downing Street. ? Lucy Young / eyevine

LONDON- ENGLAND- 26-JULY-2012- Britain's Duke and Duchess of Cambridge with Prince Harry receive the Olympic Torch at Buckingham Palace on it's route around Britain to the Olympic Stadium for the Opening of the 2012 London Olympic Games tomorrow.