Prince Harry and the publisher of the Daily Mirror settled the rest of the complaint in court on Friday, alleging wiretapping and illegal collection of information between 1991 and 2011, Sky News reported.

Mirror Group Newspapers (MGN) has agreed to pay the prince a “substantial additional sum” in damages as well as legal costs – on top of the £140,600 already awarded in December.

Solicitor David Sherborne said the publisher would make an interim payment of £400,000. Harry was not present at the trial.

The decision follows a High Court ruling late last year that MGN journalists illegally intercepted phone conversations between 1996 and 2011.

Judge Timothy Fancourt also said phone hacking had continued “to some extent” during the Leveson inquiry into media standards in 2011 and 2012, and concluded that Harry’s phone had been hacked “to a moderate extent” by MGN reporters.

Harry claims he was targeted by MGN for 15 years, starting in 1996, and that more than 140 articles in his newspapers were the result of illegal intelligence gathering, although the trial, which ends on Friday, is dealing with only 33 of them.

MGN claims that none of the 33 articles are the result of illegal information gathering. It said there was no evidence Harry’s phone was hacked and that some of Harry’s personal information was obtained from or with the consent of senior advisers at Buckingham Palace.

At the start of the trial in May, MGN admitted that a private investigator was once hired to illegally gather evidence about Harry in 2004, although the published article was not part of the trial.