The Mayor of London continues his six-day trade mission in China today in a drive to encourage closer business links with the UK capital.
It's Boris Johnson's first visit to the country since the Beijing Olympics in 2008.
China is now the world’s second largest economy, worth an estimated $8.2 trillion.
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Mayor Sadiq Khan urged Londoners to join him at 6pm in Trafalgar Square.
Pictures of today's events unfolding following a major security incident at the Houses of Parliament.