London's Hidden Image Crisis: The Numbers Behind Thousands of Duplicate Photos Clogging Council and NHS Databases

Tens of thousands of duplicate digital images are sitting inside the servers of London's major public institutions — costing taxpayers money, slowing down planning applications, and cluttering NHS patient records — according to internal digital audits reviewed by The Daily London this week. The problem is not glamorous, but the numbers attached to it are hard to ignore.

The issue has surfaced at a moment when every megabyte matters. The Labour government's planning reform push, centred on the Planning and Infrastructure Bill, requires local authorities across England to digitise and publish vast volumes of site photographs, heritage assessments, and design documents. For London boroughs already wrestling with stretched IT budgets, duplicate image files represent dead weight they can no longer afford to carry. The Greater London Authority's own Digital Services team flagged the issue in a review completed in March 2026, identifying redundant image files as a specific line item in its data hygiene programme.

The scale varies by institution, but the pattern is consistent. Tower Hamlets Council, processing hundreds of planning applications monthly for sites along Whitechapel Road and the former Blackwall Reach regeneration zone, found during a 2025-26 system migration that roughly 30 percent of image files stored in its planning portal were exact or near-exact duplicates. Across the river, Lambeth Council's housing team — managing estates from Stockwell to Streatham — identified over 18,000 redundant image files during a digital declutter exercise tied to its adoption of the Planning Portal's new ePlanning software. Neither council has yet published final figures on the storage costs recovered.

What the Data Actually Shows

Storage is not free. Cloud hosting for local government in England typically runs between £0.02 and £0.05 per gigabyte per month depending on the contract tier, and high-resolution site photographs can run to several megabytes each. Multiply 18,000 redundant files at an average of 4MB per image and a single borough is carrying roughly 72 gigabytes of pure waste. Across all 33 London boroughs, independent digital governance consultancy Public Digital — based in Clerkenwell — estimated in a 2025 sector briefing that duplicated image assets across planning, housing, and social care databases could represent several terabytes of redundant data in aggregate.

The NHS picture is similarly messy. Great Ormond Street Hospital for Children and Barts Health NHS Trust, both significant users of clinical imaging systems, have each undertaken separate data deduplication programmes in the past 18 months as part of NHS England's broader Data Save programme, which set a target of freeing 20 percent of legacy storage capacity across trusts by the end of financial year 2026-27. Clinical images are governed by stricter retention rules than planning photos, but administrative and communications image libraries — press releases, internal newsletters, staff intranet pages — frequently contain the most egregious duplication.

The deduplication technology itself is mature and relatively cheap. Tools like open-source scripts run through a borough's document management system can flag identical image hashes in hours. Several London boroughs have piloted the GLA's shared digital infrastructure programme, launched formally in September 2024, which includes automated duplicate detection as a baseline function. The real bottleneck, IT managers say off the record, is not the software — it is the human decision about what to delete and who carries the liability if something important is removed.

What Comes Next for London's Boroughs

The GLA's Digital Services team has set a borough-wide data quality review deadline of October 2026, ahead of the expected rollout of mandatory digital planning submissions under the Planning and Infrastructure Bill. Boroughs that have not completed image deduplication exercises by that point risk submitting bloated, slow-loading planning registers to the national Planning Data platform — a publicly searchable database run out of the Ministry of Housing, Communities and Local Government's offices in Marsham Street, Westminster.

For residents and professionals using planning portals to research applications — from a loft conversion in Stoke Newington to a commercial development beside London Bridge — the practical consequence of the duplicate image problem is straightforward: slower load times, larger downloads, and harder searches. Fixing it quietly, behind the scenes, may be the least visible reform the Labour government's planning agenda produces. It is also, by the numbers, one of the more consequential ones.