The National Data Guardian (NDG) has written to the Minister for Innovation in Healthcare at the UK Department of Health and Social Care. The subject of the letter concerns the level of trust from the public and the medical professional community in the NHS Federated Data Platform (FDP). The FDP platform is a system designed to consolidate and analyse medical data within the UK National Health Service (NHS). Such initiatives typically aim to improve healthcare system efficiency through better utilisation of patient information. However, such projects traditionally raise questions related to personal data confidentiality, its protection, and transparency in access conditions. The role of the National Data Guardian is to advise healthcare and social care bodies on the ethical and secure use of patient data. In the letter, the Guardian has apparently set out recommendations on how to strengthen patient and healthcare worker trust in the FDP, taking into account the sensitivity of information processed within the platform. Questions about trust in centralised medical data storage and processing systems remain relevant for healthcare systems in many countries, as citizens' and professionals' willingness to use such digital tools depends on resolving them.