London Mayor Boris Johnson launches his 2020 Vision for London at City Hall, London. PRESS ASSOCIATION Photo. Picture date: Tuesday June 11, 2013. The 2020 Vision – The Greatest City on Earth; Ambitions for London report, sets out how the capital contributes 22% of UK national output, more than at any time in history. See PA story POLITICS Johnson. Photo credit should read: Andrew Matthews/PA Wire

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