https://www.theguardian.com/business/2016/jun/26/city-of-lon...
At the end of the article : "Hood said he had already heard of three deals being put on indefinite hold. There were also reports that investors in technology start-ups in the UK were pulling out because the funds were contingent on Britain remaining in the EU."
If UKIPers have it their way, all the way, the atmosphere for foreigners will become poisonous (for an idea about how this might end up being like just watch V for Vendetta or better yet read the graphic novel).
I doubt that, though because even they're not stupid enough to bite the hand that feeds them. However, I said the same thing about the Brexit before.
The world will continue spinning, it just might not revolve around London anymore.