Prince Harry versus newspapers: This is the one that matters

While the celebrity focus will inevitably be on the prince when he goes into the witness box, that third allegation of a cover up is the most important element of this trial.

While the hit to Prince Harry’s wallet will be big, the damage to NGN’s reputation – and that of its executives – would be greater still if the court finds they were involved.

The executives the claimants will accuse of wrongdoing include the current CEO, Rebekah Brooks. She was found not guilty of conspiracy to hack voicemails in the seismic 2014 trial that ended with the jailing of Andy Coulson, her former colleague, News of the World editor and David Cameron’s communications chief.

Another is Will Lewis. He played a key role in managing the hacking crisis in 2011. He is now the CEO of the Washington Post – an appointment that has been opposed by many at the newspaper because of this association.

They and others deny wrongdoing.

Will they be giving evidence? A spokesperson for NGN said: “Both claimants allege unlawful destruction of emails by News International between 2010-2011. This allegation is wrong, unsustainable, and is strongly denied. NGN will be calling a number of witnesses including technologists, lawyers and senior staff to defeat the claim.”

Exactly what evidence Prince Harry brings to prove this claim – and what NGN says in defence – may define the entire battle.

Tuesday really is the beginning of the end. And someone is going to lose – and lose big.