From the article: "London is a great finance center in a way that New York is not." It became a great finance center in part because the UK was in the EU and al

From the article: "London is a great finance center in a way that New York is not." It became a great finance center in part because the UK was in the EU and also had strong connections to the USA. That is broken now, so it is all downhill, a lot of that business (not all of it, but a significant amount) will leave town.