Ookla Q3 Data Crowns London the Slowest 5G Network in Europe
Luke Kehoe, lead industry analyst at Ookla, told The Register that planning barriers, especially within conservation zones, create obstacles for deploying and enhancing the mobile hardware required in London.
That bottleneck has pushed the UK capital to the bottom of Europe’s mobile network league, trailing far behind continental peers in both speed and reliability under heavy loads.
When Ookla ran its Q3 2026 tests, the results revealed that London now suffers from the slowest median download speed across major European capitals at just 109.43 Mbps. Upload speeds languish at a median of 11.40 Mbps, while network latency under load—the definitive metric for how cellular architecture handles congestion—ranks as the worst on the continent.
The capital’s digital infrastructure has experienced a stark reversal of fortune. In 2021, London ranked seventh out of 18 European capitals for median download speed, boasting a peak median 5G speed of 200 Mbps in Q2 2021. By the third quarter of 2023, that figure plummeted to 102 Mbps before experiencing a minor, insufficient recovery. Paris, by stark comparison, has maintained median download speeds above 225 Mbps consistently since mid-2021.
Morning Commuter Surge Cogs Up Central London Sockets
Data traffic across the city has outpaced available mast capacity, creating severe choke points during peak business hours. In Central London, network performance craters every single weekday as commuters flood the core. Median download speeds drop down to 80.07 Mbps through the morning rush, representing a steep 27 percent performance deficit compared to weekend levels during the same hours.
Operators face structural hurdles in expanding antenna density to absorb this traffic. UK mobile providers rarely own their antenna sites. Instead, thousands of transceivers sit on commercial and residential rooftops in densely packed urban districts.
Changes introduced under the Electronic Communications Code in 2017 drastically slashed the commercial value of these leases. A central London rooftop site that once yielded roughly £21,000 ($28,000) annually now nets a property owner only about £1,000 ($1,333) a year. Stripped of financial incentives, many landlords actively decline to host network hardware, preferring to install revenue-generating solar panels instead.
Commercial building redevelopments trigger legal notices to quit, forcing operators to dismantle infrastructure. Industry estimates indicate that roughly 7 percent of London’s rooftop antenna sites sit offline at any given time due to ongoing construction churn.
Planning Objections Block Street Masts in Conservation Boroughs
Acquiring permits for new street-level hardware has become progressively more difficult, particularly within boroughs governed by stringent conservation rules such as Westminster. Applications for new street masts peaked in 2020 during the initial rollout of 5G infrastructure, but have since plummeted by more than four-fifths since 2022.
Official municipal records show that roughly three-quarters of all street mast applications filed since 2019 have faced outright rejection from local planners. In contrast, applications merely seeking to upgrade existing equipment enjoy a much higher approval rate, facing refusal only one in five times.
Ookla’s industry findings highlight that notices to quit can likewise compel rooftop locations to go offline during rebuilding projects well before substitutes are ready, leaving providers scrambling to recover lost throughput while demand continues to rise.
City Hall has acknowledged the widening infrastructure gap. A draft spatial development plan for the capital drawn up by the Mayor of London warns that frequent notices to quit have eroded London’s overall mobile connectivity compared to other equivalent cities.
The 2028 Draft Plan and the Huawei Equipment Rip-And-Replace Fallout
The municipal framework, which faces formal adoption in 2028, outlines strict new mandates for developers. Builders would be legally required to maintain uninterrupted mobile service throughout active construction projects, integrate small cells onto taller buildings and public spaces, and negotiate directly with local boroughs to establish base stations inside conservation zones.
Beyond municipal planning and rooftop economics, external geopolitical factors have strained carrier balance sheets. Professor Mohamed-Slim Alouini of the King Abdullah University of Science and Technology (KAUST) previously pointed out to The Register that the UK government’s mandated rip-and-replace directive—forcing operators to purge network hardware supplied by China-based vendor Huawei—diverted funds away from native capacity expansion.
Alouini also noted that early overhype surrounding 5G created consumer skepticism regarding its actual utility, leaving operators hesitant to commit fresh capital.
While millions of users across the broader UK enduring complete dead zones will likely offer little sympathy for the capital’s connectivity woes, London’s current standing proves that high-density urban 5G deployment requires more than initial marketing enthusiasm. It demands sustained capital expenditure, municipal cooperation, and stable physical infrastructure that local planning laws currently refuse to accommodate.
