This Practice Note addresses FAQs on data protection complaints following the Data (Use and Access) Act 2025 (DUAA 2025), covering the pre-existing position under the United Kingdom General Data Protection Regulation, Assimilated Regulation (EU) 2016/679 (UK GDPR) and the Data Protection Act 2018 (DPA 2018), the new obligation on controllers to facilitate and handle complaints which applies from 19 June 2026, and key guidance from the UK’s data protection regulator, the Information Commissioner’s Office (ICO) on this new obligation. What is the pre-Data (Use and Access) Act 2025 (DUAA 2025) position on data protection complaints? Under UK data protection law, data subjects have the right to lodge complaints with the ICO if they believe their personal data has been processed in a manner that breaches the UK GDPR or DPA 2018, Pt 3 or 4. This right is enshrined in Article 77 of the UK GDPR and DPA 2018, s 165. The ICO is required to inform the complainant of the progress and outcome of the complaint. Under