'My whole life was erased': Londoners speak out as duplicate image errors strip them from official records

Diane, a 54-year-old care worker from Tottenham, spent eleven months trying to convince her GP surgery on Philip Lane that she existed. A software migration at her North Middlesex University Hospital trust in late 2024 had created a duplicate patient profile bearing her NHS number, then flagged both entries for deletion. By spring 2025, her prescription history, referral letters and vaccination record had vanished from the system. She is one of dozens of Londoners who have contacted advocacy groups in recent weeks after discovering their records were wiped or scrambled by what data managers call a "duplicate image replacement" error — a process designed to consolidate redundant files that, when it misfires, erases the legitimate one.

The issue is landing hard right now because NHS trusts across London are midway through a £480 million data infrastructure upgrade tied to the government's broader NHS reform programme, with a completion deadline of March 2027. At the same time, the Greater London Authority has been migrating resident data as part of its Datastore modernisation project. Two simultaneous large-scale system overhauls, affecting millions of records, means the margin for error is unusually wide — and the consequences for individuals are unusually severe.

Inside the error: what duplicate image replacement actually does

The term sounds technical but the mechanism is straightforward. When a database holds two entries for the same person — perhaps because a name was spelled differently at two different registration points — automated cleaning software identifies one as the "master" and one as the "image." It then replaces the image with the master, or deletes it outright. The problem arises when the system designates the wrong record as master, or when the two entries belong to different people who happen to share a name, date of birth, or postcode. Patient groups and digital rights advocates say the NHS's reliance on surname plus date of birth as matching criteria is particularly prone to false merges in areas with large communities sharing common surnames.

Islington-based digital rights group the Open Rights Group has logged complaints from residents across seven London boroughs since January 2026, with Newham, Tower Hamlets and Lambeth appearing most frequently. The group says the pattern correlates with postcodes where multiple NHS registration drives took place in quick succession — including the mass re-registration campaigns that followed three GP surgery closures in east London in 2023 and 2024. Separate to the NHS issue, Hackney Council acknowledged in May 2026 that a housing portal migration had affected an undisclosed number of resident accounts, with some applicants temporarily removed from the social housing waiting list maintained under the Locata system.

Residents describe months of bureaucratic limbo

One resident from Dalston, a 38-year-old man who asked not to be identified by name because his immigration status is under review, described travelling to Homerton Hospital on three separate occasions before a consultant's receptionist manually cross-checked paper records and found his file. Another woman, who lives near Brixton Market in Lambeth and has a child with a long-term respiratory condition, said her daughter's referral to King's College Hospital paediatric unit was delayed by more than six weeks while administrators resolved a duplicate flag on her child's records. Neither case has been formally confirmed as a duplicate image replacement error in writing from their respective trusts.

NHS England's Patient Safety Incident Response Framework, updated in September 2023, requires trusts to report incidents involving patient data loss that cause or could cause patient harm. Campaigners argue that the threshold for what constitutes reportable harm is being interpreted too narrowly when it comes to record errors, and that many affected patients are never formally notified.

For those who discover a problem, the practical starting point is a Subject Access Request under the UK GDPR, which organisations must respond to within one calendar month. The Information Commissioner's Office on Wycliffe House in Wilmslow handles escalated complaints, and the ICO's online portal allows cases to be submitted without charge. Locally, the Patient Advice and Liaison Service at each NHS trust can intervene directly — PALS offices at both Homerton Hospital in Hackney and King's College Hospital in Denmark Hill have dedicated data query lines. Residents on social housing waiting lists who suspect their Locata account has been affected should contact their borough's housing needs team in writing, keeping a date-stamped copy, to preserve their original application date.