Boris Johnson celebrated an agreement for British designer Thomas Heatherwick to build two Beijing underground stations by taking a trip on the network himself. London's Mayor said Britain remained competitive internationally in creative industries, like design and fashion.
Thomas Heatherwick, who designed the cauldron that featured in the London 2012 Olympics opening ceremony, could also be commissioned to build an entire line for Beijing's underground, which could include 15 to 20 stations.
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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.