Prince Harry has given his first interview since his privacy lawsuit win against a major U.K. tabloid, speaking at length about the ongoing legal battle and why the late Queen Elizabeth II is “very much up there saying, ‘See this through to the end.’”

In ITV documentary Tabloids on Trial, which aired in the U.K. on Thursday night, the Duke of Sussex was among a myriad of names, including High Grant, former England soccer star Paul Gascoigne and ex-Prime Minister Gordon Brown, who opened up about their fight for justice in the extensive phone-hacking scandal and subsequent legal battles.

Grant was also among those involved in the NGN lawsuits (he settled the illegal case last month after steep legal costs forced his hand, he revealed in the doc). NGN has denied any illegal wrongdoing ever took place.

In December, London judge Justice Timothy Fancourt ruled in Harry’s favor in a 386-page decision handed down in the High Court; he said that phone hacking, which for the prince dated back to 2003, was “widespread and habitual” at Mirror Newspapers — and that executives there had covered it up. Harry, who is breaking with royal tradition in this fight, becoming the first in the family to testify in open court in over a century, also has a pending case against British red top The Daily Mail.

Harry alleges that his voicemails were intercepted and flight records blagged – a term meaning information was obtained dishonestly – among other enormous invasions of his privacy. “It felt like harassment,” he said of being mobbed by paparazzi. “It felt horrible then. It feels horrible now.”

“There’s no one better placed to see this thing through than myself,” he continued, before discussing the danger the tabloid press poses to his family’s safety. “It’s one of the reasons why I won’t bring my wife back to this country.” Barry then asked him if his “granny” – Queen Elizabeth II – would be supportive of the legal action. “We had many conversations before she passed. This is very much something she supported. She knew how much this meant to me,” he recalled. “She’s very much up there saying, ‘See this through to the end,’ without question.”

The prince also said it “would be nice” if he had the support of his family, though he is doing it for “my reasons.” “Anything I say about my family results in a torrent of abuse from the press. I’ve made it clear that this is something that needs to be done.” He voiced fears that his mother, Princess Diana, was an early victim of phone hacking.

Grant settled out of court, which he believes implies guilt: “If you’re innocent, why do you shove so much money at someone so you don’t have to go to court?” he said. But he purports that settling was the only way forward because if he went to court and won, “even one penny less” offered in damages meant he would have to cover both sides’ costs. “And that would have been about 10 million quid.”

The documentary also covers accusations of a cover-up, including that thousands of emails before 2004 were deleted from NGN servers. The company maintains that this was a “long-scheduled” clear out of their systems and no cover-up took place. Harry hopes his trial will begin as early as next year.

While NGN has continued to refute unlawful activity occurred, a spokesperson for MGN said when the prince won his claims against the group: “We are pleased to have reached this agreement, which gives our business further clarity to move forward from events that took place many years ago and for which we have apologized.”