Now that the Olympics and Paralympics have drawn to a close - many are asking what the legacy will be for London.
As other hosts have found to their cost and frustration - this can be a real challenge. Centre for Cities, a think tank, has got a five point plan which it says will make sure we learn from previous host cities, such as Sydney and Barcelona.
Alexandra Jones, chief executive at Centre for Cities, told the Today programme that London needed "one clear plan and vision" for the next 25 years.
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