Boris Johnson said: It's been the most incredible epoch in the history of cycling that any of us can remember; and I am absolutely delighted that the world’s greatest cycling race is coming to the capital.
People will see London framed by shooting velocipedes for what will be a fantastic spectacle of sport. I am going to be in the crowd and I hope thousands more will too.”
Click here for detailed map of Tour de France route
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A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.