City 'must reinvent itself in the age of Brexit'
Big Bang was the dramatic moment in 1986 when the City of London embraced a new type of global finance.
Like it or loathe it, the City now contributes almost 12% to the UK's economy. But what next for the Square Mile as it looks to a new, digital future in the wake of Brexit.
The journalist Iain Martin has written a book charting the history of the City and how it will face new challenges.