The processing of personal data for law enforcement purposes is regulated by Part 3 of the Data Protection Act 2018 (DPA 2018) and is a separate regime to the general processing of personal data under the UK General Data Protection Regulation, Assimilated Regulation (EU) 2016/679 (UK GDPR). DPA 2018, Pt 3 applies to competent authorities which process personal data for ‘law enforcement purposes’. It covers processing for the prevention, investigation, detection or prosecution of criminal offences, or the execution of criminal penalties, including the safeguarding against, and the prevention of, threats to public security. DPA 2018, Pt 3 incorporated the EU Law Enforcement Directive (EU) 2016/680 (EU LED) into UK law. The Information Commission’s Office (ICO) has published guidance specifically on the obligations under DPA 2018, Pt 3 which is essential reading for those advising on this area. The ICO guidance, which is currently under review, can be accessed here. The Data (Use and Access) Act 2025 (DUAA 2025) introduces significant amendments to DPA 2018 and UK GDPR.