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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The inaugural service left London Liverpool Street for Shenfield, Essex, on the existing TfL Rail route on Thursday morning.
Councils believe that 600 high-rise blocks in England are wrapped in potentially flammable cladding, Downing Street announces.