Mayor of London Boris Johnson has opened a new technology centre this morning near the Barbican.
The Digital Media Development Centre is run by the website Amazon and will bring 100 jobs to the capital.
The mayor is hoping it will boost London's reputation as a high-tech city.
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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.