The Duke of Sussex has returned to the Royal Courts of Justice for the second day of a High Court hearing over multiple privacy claims brought against the publisher of the Daily Mail.

Harry arrived at the central London court just after 10am for the second day of a preliminary hearing in his claim against Associated Newspapers Limited (ANL).

The duke is part of a group - along with Baroness Doreen Lawrence, Sir Elton John and David Furnish, former Liberal Democrat MP Sir Simon Hughes and actresses Sadie Frost and Liz Hurley - bringing claims over allegations ANL carried out or commissioned illegal or unlawful information-gathering.

The allegations - which are denied - include the hiring of private investigators to place listening devices inside cars and the accessing and recording of private phone conversations.

Lawyers for ANL, which is also the publisher of The Mail on Sunday and MailOnline, said the allegations are “firmly” denied and that the “stale” claims have been brought too late as it made a bid to throw out the cases.

A High Court judge has said he is “concerned” about who is responsible for policing confidentiality undertakings made during the Leveson Inquiry.

Associated Newspapers Limited (ANL)’s argument is that part of the case brought by seven high-profile individuals relies upon documents that were provided by the company to the Leveson Inquiry in 2011 and 2012 with the understanding that they were confidential.

The company maintains that these documents are subject to binding disclosure and publication restriction orders and undertakings as to their use, and that lawyers for the people bringing the claim are in breach of these by relying on them without first applying for their disclosure.

However on Tuesday, Mr Justice Nicklin said it was not clear who polices the undertakings as the Leveson Inquiry no longer exists.

He said that “basic contract law” requires that in order for a confidentiality agreement to be enforced someone has to be able to stand there and say that they have the power to enforce it.

“Who is that person?” he asked, adding: “I am now concerned about who is responsible for policing the Leveson undertakings.”

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The Duke of Sussex claims he was “largely deprived” of important parts of his teenage years due to the unlawful actions of the Daily Mail’s publisher, court documents have shown as he made a surprise appearance at the High Court in London.

Harry, Sir Elton John, his husband David Furnish, Baroness Doreen Lawrence of Clarendon and Sadie Frost all attended the Royal Courts of Justice on Monday for the start of the first hearing in their claims against Associated Newspapers Limited (ANL).

The high-profile individuals are part of a group, which also includes Liz Hurley and former Lib Dem MP Sir Simon Hughes, bringing privacy claims against the publisher over allegations it carried out or commissioned illegal or unlawful information-gathering.

A High Court judge has said he is “concerned” about who is responsible for policing confidentiality undertakings made during the Leveson Inquiry.

Associated Newspapers Limited (ANL)’s argument is that part of the case brought by seven high-profile individuals relies upon documents that were provided by the company to the Leveson Inquiry in 2011 and 2012 with the understanding that they were confidential.

The company maintains that these documents are subject to binding disclosure and publication restriction orders and undertakings as to their use, and that lawyers for the people bringing the claim are in breach of these by relying on them without first applying for their disclosure.

However on Tuesday, Mr Justice Nicklin said it was not clear who polices the undertakings as the Leveson Inquiry no longer exists.

He said that “basic contract law” requires that in order for a confidentiality agreement to be enforced someone has to be able to stand there and say that they have the power to enforce it.

“Who is that person?” he asked, adding: “I am now concerned about who is responsible for policing the Leveson undertakings.”

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Sir Elton John and David Furnish had not seen a copy of their first child’s birth certificate before it was “unlawfully” obtained by the publisher of the Daily Mail and placed beneath a “derogatory” headline, the High Court has been told.

The singer and his filmmaker husband were described as “outraged” and “mortified” in court documents alleging that the privacy of their home was “ruthlessly invaded” – with their landline allegedly tapped and staff “targeted” – in order “to steal and exploit” information to fuel stories about them.

The couple’s allegations form part of a host of similar claims brought against Associated Newspapers Ltd (ANL) by a group comprising Prince Harry, Baroness Doreen Lawrence, actors Sadie Frost and Elizabeth Hurley, and former Liberal Democrat MP Sir Simon Hughes.

Lawyers are yet to get into their arguments over the continuation of the claims against ANL and whether they should be taken to trial.

Meanwhile, Baroness Lawrence has entered the court room.

She told the court yesterday through her lawyers that she feels a “deep sense of betrayal” over Associated Newspapers Limited (ANL) allegedly hiring private investigators to “unlawfully or illegally” obtain her private information.

Thomas Kingsley reports live from the High Court

Every seat in the public gallery is filled for today’s hearing with Prince Harry, today wearing a grey suit, is in attendance again listening attentively to the proceedings.

Lawyers have not yet begun to discuss their arguments for why the claims from the Duke and others should be taken to trial or thrown out - first there is a discussion over legal details around confidentiality and restricted documents in this week’s hearing.

The Duke of Sussex has made a surprise return to the UK for the first time since the late Queen’s funeral – but is not expected to meet with the King or the Prince of Wales.

His trip – for a High Court hearing in London in his claim against Daily Mail publisher Associated Newspapers over allegations of unlawful information-gathering – will be seen as demonstrating the strength of his determination over the legal action.

Just weeks ago, Harry laid bare his troubled relationship with his father the King and brother the Prince of Wales in his controversial autobiography Spare.

Day two of the four-day preliminary hearing has begun in the High Court. Prince Harry is in attendance again as the judge decides whether the claim will go to trial.