“It’s a horrible experience,” the Duke of Sussex said as he concluded emotional testimony in his lawsuit against the publisher of the 'Daily Mail'

Prince Harry is back in London for a high-stakes courtroom clash with UK tabloids that could redefine his long war with the press.

Alleged unlawful information gathering by two UK newspapers made Prince Harry "paranoid beyond belief" and left Elton John feeling "violated", the pair have testified as a joint lawsuit opened Monday in the High Court.

During rare court testimony by a British royal, Harry refuted suggestions that reporters obtained information legally by being part of his circle of friends.