The United Kingdom’s Ministry of Defence (MoD) has acknowledged that it holds a substantial collection of medical records related to veterans who took part in Cold War-era nuclear tests. Approximately 50,000 paper files are reportedly stored in a climate-controlled warehouse under the supervision of scientists at Porton Down, a government laboratory in Wiltshire. Despite their significance, these records have not yet been fully examined.

The existence of this extensive archive came to light following a two-year review launched in 2024, which sought to locate missing medical records of veterans monitored during Britain’s atomic weapons trials. These veterans, who participated in 45 nuclear tests conducted by the UK, have long asserted that their medical documentation—covering blood, urine, thyroid tests, and chest X-rays—had been lost or destroyed. Earlier investigations, including one published last month, failed to account for the majority of the files, heightening concerns over transparency and veterans’ health oversight.

The cache of documents was discovered in a warehouse in Swadlincote, Derbyshire, but has yet to be systematically reviewed. A group of Members of Parliament, including Rebecca Long-Bailey, has urged Defence Secretary Wes Streeting to initiate a thorough search of the archive. Long-Bailey expressed hope that the new Prime Minister, who has publicly supported the claims and welfare of veterans, will ensure the records are investigated promptly ahead of Parliament’s return from its summer recess.

The MoD has been contacted for further comment on the matter. The discovery raises important questions about the historical handling of veterans’ health data and the extent to which government departments have maintained oversight over medical monitoring programmes associated with nuclear testing. Veterans and their advocates continue to call for full access to the records in order to understand any long-term health impacts related to their exposure during the tests.