Police search warrants and privileged material: what a successful challenge means
On 8 October 2026, the High Court published reasons explaining a successful challenge to police search warrants. The case illustrates safeguards affecting protected documents and devices.
What the court explained
In proceedings brought by Andrew Mountbatten-Windsor, Mr Justice Hilliard explained that police had conceded that warrants issued under section 8 of the Police and Criminal Evidence Act 1984 (PACE) were unlawful.
Legally privileged material was envisaged, and special procedure material was likely to be involved. The section 8 requirements were not met. Judicial review resolved the challenge by agreement, without a contested determination of every ground.
Why the type of material matters
Section 8 is subject to safeguards concerning legally privileged, excluded and special procedure material. Different statutory procedures apply to obtaining certain protected records. The existence of a criminal investigation does not remove those safeguards.
Legal privilege and confidentiality are distinct questions. Calling a file confidential does not, by itself, settle which statutory protections apply. Likewise, the presence of a lawyer's name in an email does not resolve whether the communication attracts privilege. The material and the circumstances in which it was created need individual assessment.
For a business owner or professional, that assessment may need to cover both paper records and digital communications. Identifying potentially protected material early can help a solicitor raise focused concerns about how documents or devices should be handled.
Does an unlawful warrant end the investigation?
The judge expressly explained that quashing the warrants did not end the investigation. Police had applied under section 59 of the Criminal Justice and Police Act 2001 to retain material on an alternative lawful basis. That opposed application remained undecided.
A warrant challenge, the return or retention of property, and the treatment of evidence in any later criminal proceedings require separate consideration. A successful challenge should therefore be assessed alongside the next steps in the investigation, rather than treated as a promise that every associated issue has been resolved.
Practical steps following a search
Seek legal advice promptly and keep the paperwork provided by the police. PACE Code B addresses copies of the warrant and Notice of Powers and Rights, subject to its stated qualifications. It also requires records of searches and seized articles.
Give your solicitor the warrant, any seizure list and a clear account of what happened. Record the dates, the premises searched, the devices or documents taken and any concerns raised at the time. Identify potentially privileged communications without circulating their contents unnecessarily.
Do not obstruct a search or delete, alter or move material to prevent its examination. Ask your solicitor to assess the authority relied upon, the handling of protected records and any available challenge or application concerning seized property. The appropriate response depends on the particular facts and powers being used.
Peter Bonner & Co can discuss representation during a criminal investigation, including concerns about searches and seized evidence. Early advice helps identify the issues that need attention before decisions are made about interview or the wider defence.
This article provides general information about England and Wales, current at 9 October 2026. It is not legal advice on an individual case. Obtain advice about your own circumstances.