London Councils Battle Duplicate Photos Threatening Planning Records Crisis

Thousands of planning application images held by London borough councils are duplicated, misfiled or simply wrong. That is the uncomfortable finding emerging from a cross-borough data audit quietly under way since January 2026, involving the Greater London Authority's Planning Datahub and at least fourteen local authorities. The problem sounds administrative. The consequences are not.

When a developer submits a planning application for, say, a site on Old Kent Road in Southwark or along the Meridian Water regeneration corridor in Enfield, officers rely on photographic evidence to assess existing conditions, heritage impact and design fit. Duplicate images — sometimes dozens of identical files uploaded under different reference numbers — clog case management systems, slow officer decision times and, in at least some instances recorded by the audit, have led to conditions being assessed against the wrong building entirely. With Labour's Planning and Infrastructure Bill currently before Parliament and Sadiq Khan pressing for faster delivery of the 88,000 homes a year London needs, the timing could hardly be worse.

Why the Problem Has Festered

The root cause is structural. London's 33 borough councils each run their own planning portals, most of them built on legacy software from the early 2010s. Southwark, Hackney and Tower Hamlets all use variants of the Idox Uniform platform, which does not automatically flag duplicate image uploads. A file named IMG_0047.jpg submitted by an agent in February and again in March will sit as two separate documents unless an officer manually checks. Few do — caseloads across inner London boroughs average around 120 live applications per officer, according to figures circulated at a London Councils planning leads meeting held in Southwark this spring.

The GLA's Planning Datahub, launched formally in 2023 to centralise and standardise application data across the capital, was supposed to address exactly this kind of inconsistency. It has made progress on structured data — use classes, site areas, decision outcomes. Image metadata has proved far harder. JPEG and PDF files arrive without consistent naming conventions, geotags are frequently absent or wrong, and there is no shared taxonomy that would let automated tools match duplicates across borough boundaries. Camden Council ran a small-scale deduplication pilot on its own records in late 2025, clearing roughly 4,200 redundant image files from a single development cluster around Euston, but scaling that borough by borough across London has not yet been funded or mandated.

The Decisions That Will Shape What Comes Next

Several choices now sit on the desks of senior officials and ministers. The most immediate is whether the Department for Housing, Communities and Local Government will include mandatory image metadata standards in the secondary legislation expected to accompany the Planning and Infrastructure Bill later this year. A draft framework circulated among planning authorities in May 2026 referenced the Open Standards Principles but stopped short of specifying image requirements — a gap that digital planning advocates have flagged publicly.

At City Hall, the question is whether the GLA will extend the Datahub's remit and budget to cover image deduplication tools. The Datahub's current annual operating allocation sits at around £2.1 million, a figure understood to cover staff, licensing and infrastructure but not a major image processing initiative. Any expansion would require sign-off from the Mayor's office and, given pressure on the GLA's overall budget, is likely to compete with priorities including the Superloop bus network and Thames path improvements.

For borough planning departments, the practical decisions are more immediate. Councils that delay updating their image submission guidance risk compounding the backlog. Islington and Lambeth have both signalled they will revise their agent guidance notes before autumn, requiring georeferenced images and standardised file naming from October 2026. That will help on new applications. The backlog of historic records — some stretching back fifteen years — is a separate and larger problem with no agreed solution yet.

The audit's final report is expected by September 2026. Planning officers, developers and heritage bodies will be watching what recommendations it makes and, more critically, whether government backs them with money and legal force. Without both, London's duplicate image problem will remain exactly what it is today: known, documented, and unresolved.