Sam Patten, an American consultant later mired in controversy, exploited emails obtained by Tal Hanan’s team

In late December 2014, a team from Cambridge Analytica flew to Madrid for meetings with a handful of old and new contacts. A member of the former Libyan royal family referred to as “His Royal Highness” was there. So, too, was the son of a US billionaire, a Nigerian businessman and a private Israeli intelligence operative.

For Alexander Nix, the Etonian chief executive of Cambridge Analytica, and his new employee Brittany Kaiser, who networked like most other people breathed, there may have been nothing unusual about such a gathering.