The square mile of London is in the midst of a colossal building boom. But the new buildings have a particular challenge - they have to stand on a city street plan that hasn't changed in a thousand years.

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Story: Old and New City of London

Duration: 2:04

The square mile of London is in the midst of a colossal building boom. But the new buildings have a particular challenge - they have to stand on a city street plan that hasn't changed in a thousand years.

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