High Court Rules Search Warrants Used at Andrew Mountbatten-Windsor's Homes Were Unlawful, but Investigation Continues

Thames Valley Police has acknowledged that the search warrants used to raid the homes of Andrew Mountbatten-Windsor earlier this year were unlawful, a concession made during a High Court hearing on Thursday. The former prince was arrested on 19 February on suspicion of misconduct in public office, prompting a legal challenge from his representatives over the validity of the warrants that authorised officers to search his properties.

The ruling marks a significant development in a case that has drawn widespread attention, but it does not signal an end to the criminal investigation. Mr Justice Hilliard, presiding at the High Court, confirmed that both Mountbatten-Windsor and the police had reached an agreement that the warrants were unlawful. However, he was careful to emphasise that quashing the warrants does not terminate the broader investigation or render the entire probe unlawful.

The legal dispute centres on the specific legislation under which the warrants were issued. Thames Valley Police had applied for search warrants under sections eight and nine of the Police and Criminal Evidence Act 1984 during a hearing at the Central Criminal Court the day before the searches were carried out. The court determined that only section eight warrants were necessary and granted them on that basis. A subsequent legal challenge established that the court should have issued the warrants under section nine instead.

This distinction is far from a technicality. Section nine warrants carry stricter safeguards designed to protect sensitive material, including legal advice between a suspect and their lawyer, as well as confidential documents that may belong to third parties such as an employer. Under the correct legal framework, police are required to consider in advance whether such protected material might be seized during a search, and if it is encountered, they should typically return it rather than use it as evidence.

The error meant that these safeguards were not properly applied when officers searched Mountbatten-Windsor's homes. Despite this, the judge explained why police could continue to hold onto the items seized during the raids. He noted that there would be little purpose in returning property if it could simply be lawfully seized again under a different legal provision. This reasoning means the documents and electronic devices remain in police custody for the time being.

A further hearing is scheduled for 2027 to determine whether the seized material can ultimately be used as evidence. Mountbatten-Windsor opposes the police's bid to retain the evidence, and the next stage of the legal wrangle will involve a behind-closed-doors session where Thames Valley Police must convince a judge that the material is likely to be of substantial value to their investigation under alternative powers designed for such situations.

The arrest itself followed the publication of documents by the US Department of Justice that raised suspicions Mountbatten-Windsor had forwarded confidential information to the convicted sex offender Jeffrey Epstein. At the time of the alleged conduct, Mountbatten-Windsor was serving as a UK trade envoy in 2010. He has consistently denied any wrongdoing in relation to Epstein, and he maintains his innocence regarding the misconduct in public office allegation.

A spokesperson for Thames Valley Police said the agreement that led to the quashing of the warrants relates specifically to a court decision about their legal basis and does not constitute a judgement on the ongoing investigation. The force stated it ensured the court was presented with all necessary information and paperwork, and that it followed correct legal processes throughout. It accepted that the initial court's decision to issue warrants under the specific piece of legislation used was incorrect, meaning they must be legally quashed.

The spokesperson added that legal proceedings are currently ongoing to decide how material seized during the searches will be managed and whether police can lawfully retain it in support of their investigation. The force also confirmed that its investigation into alleged misconduct in public office by a man in his 60s from Norfolk remains active, and that officers continue to pursue all reasonable lines of enquiry to progress the case effectively and fairly.

The case raises broader questions about the legal safeguards surrounding police searches, particularly when sensitive or privileged material may be involved. Legal experts note that the requirement to obtain the correct category of warrant is not merely procedural but reflects fundamental protections for suspects and third parties. When these protections are overlooked, it can undermine public confidence in the investigation, even if the underlying inquiry itself remains valid.

The former prince launched a judicial review to challenge the actions of the force's chief constable and the Central Criminal Court in the build-up to his arrest. His legal team argued that the warrants were improperly issued, and the High Court's ruling on Thursday effectively validated that position. Yet the practical consequences remain limited for now, as the seized items stay with police and the investigation presses forward.

For Mountbatten-Windsor, the ruling represents a partial legal victory, but it does not clear him of suspicion or halt the police work. He continues to deny any wrongdoing, and no charges have been brought. The 2027 hearing will be pivotal in determining whether the evidence gathered during the searches can be deployed in any future prosecution, or whether it must be returned or excluded.

The broader implications extend beyond this individual case. The ruling highlights the importance of precision when police seek search warrants, especially in high-profile investigations where the scrutiny is intense. A failure to use the correct legal mechanism can lead to warrants being quashed, potentially complicating the path to justice and prompting debates about the balance between investigative powers and individual rights.

As the legal process unfolds, both Thames Valley Police and Mountbatten-Windsor's representatives will prepare for the next phase of the dispute. The force remains committed to its investigation, while the former prince's legal team will continue to challenge the retention of his property. The outcome will shape not only the trajectory of this case but also reinforce the standards expected of law enforcement when pursuing sensitive inquiries.