Watch: What is Brexit?

Ahead of a June 23 referendum on European Union membership, many of London's leading lights are deeply worried about its future. Since almost exactly 30 years ago, when Conservative Prime Minister Margaret Thatcher liberalised finance through a package of reforms so dramatic it was dubbed the Big Bang, London has become the undisputed financial capital of a united Europe - a status that now hangs in the balance.

Related Content

Must watch video

NZ Herald Focus video

Entertainment video

Lifestyle video

National video

World video

Business video