Harry had asked for access to “relevant emails sent between five email accounts of NGN employees and five employees of the royal household” between January 2013 and September 2019.

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The household employees “are those involved in royal communications and the private secretaries to Her Majesty Queen Elizabeth II” – who during that period were Sir Christopher Geidt and Sir Edward Young.

The NGN employees included Rebekah Brooks, chief executive of News UK, her predecessor, Mike Darcey, and Robert Thomson, chief executive of News Corp.

Harry previously alleged that Buckingham Palace had a “secret agreement” with Rupert Murdoch’s newspaper group.

He claimed his grandmother knew about the deal, under which the royal family agreed not to sue the publisher in return for an apology and settlement at a later date.

The allegation was strongly denied by all sides and rejected as “implausible” by a judge, who did not allow it to form part of his case.

In March 2023, Harry revealed that his brother William, the Prince of Wales, had quietly settled a phone hacking claim for a “very large sum” against NGN, three years earlier.

The court heard that some emails had already been provided to the duke by Brooks as early as April last year, but Sherborne said these had been “cherry-picked”.

He alleged that further disclosure was “highly likely to be relevant” and may lead the court to draw “inescapable inferences”.

NGN opposed the “disproportionate, time-consuming and costly” bid, arguing that “extracting” the emails would cost £17,000 ($33,170).

Meanwhile, it emerged that Harry one of only two remaining claimants still pursuing legal action against NGN after 39 others settled their cases.

Only Prince Harry and Tom Watson, the former deputy Labour leader, have opted to push on towards a trial, scheduled for January 2025.

Those who have agreed settlements in recent months include Spice Girl Melanie Brown, former BBC executive Alan Yentob, Game of Thrones actor Alfie Allen, David Beckham’s father Ted Beckham, and Ben Elliot, Queen Camilla’s nephew.

Sherborne had previously suggested that claimants were being forced to settle to avoid being lumbered with huge legal bills if they rejected a settlement offer, even if they won at trial.

On the settlements, an NGN spokesman said: “In some disputed cases, it has made commercial sense to come to a settlement agreement before trial to bring a resolution to the matter.

“As we reach the tail end of the litigation, NGN is drawing a line under the disputed matters.”

The trial is expected to last between six and eight weeks, with a further hearing due to be held in December.

The Telegraph, London