What is the legacy of the 'Big Bang' in the City?

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It is 25 years since City trading was computerised in what was known at the time as the Big Bang.

At first it seemed the only difference was less noise and gesturing on the London Stock Exchange floor but, a quarter of a century later, everything has changed - and not necessarily for the better.

Katharine Carpenter speaks to David Kynaston, a historian and author of City of London: The History, and David Buik, who has spent nearly 50 years working in the City.

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