Follow the data: does a legal document link Brexit campaigns to US billionaire?

The Guardian 

"We had a guy called Matthew Richardson who'd known Nigel for a long time and he's always looked after the Mercers. The Mercers had said that here's this company that we think might be useful." He said that Mercer, Farage and co had all met at a conference in Washington. "The best dinner we ever went to. Around that table were all the rejects of the political world. And the rejects of the political world are now effectively in the White House.