Duplicate Images on Council and NHS Digital Records Are Causing Real Harm to Londoners — Here's Why It Matters

A growing administrative crisis is quietly disrupting the lives of Londoners who rely on council services and NHS care: duplicate images — scanned documents, identity photographs and medical imagery filed twice or more under different reference numbers — are causing delays, errors and, in the most serious cases, patients receiving the wrong clinical information. The problem has become acute enough that Barts Health NHS Trust, which runs the Royal London Hospital in Whitechapel and Newham University Hospital in Stratford, began a dedicated data-cleansing programme in January 2026 to address duplicate records across its imaging systems.

The timing is not coincidental. The Labour government's push to digitise NHS records nationally — part of a 10-year plan first outlined in the 2024 autumn budget — has accelerated the migration of paper files and legacy scans into unified electronic systems. When documents are migrated in bulk, duplicates multiply. For London, which processes more NHS imaging referrals per capita than any other English region, the consequences are magnified.

What a Duplicate Image Actually Costs a Resident

The practical harm is specific and immediate. A resident in Hackney applying for social housing through the London Borough of Hackney's housing portal may upload a photograph for identity verification, only to find the application stalls because an older scan from a previous application — taken under a slightly different name format — flags as a conflict. The council's housing waiting list in Hackney stood at more than 10,000 households as of March 2026, according to the borough's published housing statistics, meaning any delay caused by a data clash pushes families further back in an already punishing queue.

At the NHS level the stakes are higher. Duplicate medical images — chest X-rays, MRI scans, pathology slides — can sit alongside correct records without being flagged, potentially causing a clinician to work from an outdated or mislabelled file. The NHS England Patient Safety Incident Response Framework, updated in autumn 2024, identifies duplicate record creation as a Category B data risk, requiring trusts to report instances where duplicates could have influenced clinical decision-making. Across North Central London Integrated Care Board, which covers boroughs from Barnet to Islington, a freedom of information request published in April 2026 showed 3,847 duplicate imaging records had been identified and flagged for removal over the preceding 12 months — a figure NHS administrators said represented only the cases that had surfaced through audit, not an exhaustive count.

The issue extends beyond health. Transport for London's Oyster and contactless account system, administered from its Palestra House headquarters in Southwark, has also faced duplicate identity-document submissions from residents applying for 60-plus Oyster cards or Zip cards for young people. TfL's customer services team confirmed in its 2025-26 annual accessibility report that unresolved duplicate submissions were among the top five reasons for delayed concessionary card issuance.

What Boroughs and Trusts Are Now Doing

Efforts to fix the problem are underway but uneven. The London Borough of Tower Hamlets commissioned a data audit across its housing and revenues systems in February 2026, working with a Manchester-based public sector IT contractor. Barts Health has deployed automated deduplication software across its picture archiving system, with the goal of clearing a backlog of flagged files by September 2026. The challenge, which IT managers at the trust have described publicly at NHS Digital conferences, is that automated tools can misidentify legitimate separate records as duplicates — particularly for patients with common surnames or those treated under emergency aliases.

For residents, the most effective immediate step is to contact the data controller at their relevant borough or NHS trust directly and request a Subject Access Request under the UK GDPR — a legal right that forces the organisation to show every record held in a resident's name. The Information Commissioner's Office, which has its London office at 35 Water Lane in the City of London, has published updated guidance on how to challenge incorrect or duplicated records, including a template complaint letter available on its website. Trusts and councils are legally required to respond within one calendar month. That is a short window, but it is the clearest lever a Londoner currently has.