“In the final four days [before the British EU referendum], YouGov, Survation, ComRes and BMG all published polls showing Remain ahead. Some of their polling specifically was cited by currency analysts for moving the pound higher in the final week. Populus showed Remain winning by 10 points, making it the most off-base poll released. That one came out the day of the vote. None of the pollsters publicly disclosed that they were simultaneously working for hedge funds that stood to make massive profits if the results went the other way—against all expectations.” https://www.bloomberg.com/news/features/2018-06-25/brexit-big-short-how-pollsters-helped-hedge-funds-beat-the-crash
While British citizens remain in political paralysis, some sectors leave with billions.