Is London architecture still world-leading?

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Big Ben tower, modern almshouses, a Japanese inspired house, and a university building. Two thirds of the projects on the recently announced RIBA Stirling Prize shortlist are in London. Last year’s winners were the architects behind the Elizabeth Line – but will we see a winner in the capital again this year? And why does London continue to dominate when it comes to architectural design vision, innovation and originality. BBC Radio London's Ross Ryan has more. (Image credit: RIBA)