Observer journalist Carole Cadwalladr and prominent Brexiteer Arron Banks were both at the High Court today for the start of a libel trial.

The court heard allegations that Cadwalladr, who broke the Cambridge Analytica scandal, defamed Leave.EU co-founder Banks in a Ted Talk she gave in April, during a speech at a convention in June and in two tweets sent in June and July.

During the Ted Talk, which is still available online, Cadwalladr said: “And I’m not even going to go into the lies that Arron Banks has told about his covert relationship with the Russian government.”