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Policy & Impact Reports and resources Full Fact Report 2026 Full Fact AI How we fact check After we fact check Full Fact in the press About About Full Fact is the UK's independent fact checking charity. We put reliable evidence at the heart of public debate so you can make sense of what matters. Who we are Our team Careers Funding Independence Impartiality Feedback & corrections International networks FAQs Contact us Search Fact check Full Fact Team Published 15 September 2025 Updated 19 September 2025 Reading time 2 mins Topic Culture & Society Tags Social media London Unite the Kingdom march Flags Share Articles / Culture & Society / Fact check 15 September 2025 Fact check Did police estimate three million people attended the ‘Unite the Kingdom’ march? By Full Fact Team • Culture & Society • 2 mins What was claimed The police estimated that three million people attended the “Unite the Kingdom” event in London. Our verdict False. The Metropolitan Police estimated that between 110,000 and 150,000 people attended. Multiple social media users are falsely claiming that police have estimated three million people attended the “Unite the Kingdom” protest march in central London at the weekend. But the official estimate from the Metropolitan Police Service (MPS) was that between 110,000 and 150,000 were in attendance. The three million figure was also shared by the event’s organiser Tommy Robinson (whose real name is Stephen Yaxley-Lennon), who posted on X (formerly Twitter) “I’m hearing police estimate 3 million patriots on the streets”, and later criticised “legacy media” outlets for reporting the Metropolitan Police’s estimate. We’ve contacted Mr Robinson for comment and will update this fact check if we receive a response. Join 75,000 newsletter subscribers who trust us to check the facts Sign up to get weekly updates on politics, immigration, health and more. leave this field blank to prove your humanity Your email address What should we call you? Sign up Subscribe to weekly email newsletters from Full Fact for updates on politics, immigration, health and more. Our fact checks are free to read but not to produce, so you will also get occasional emails about fundraising and other ways you can help. You can unsubscribe at any time. For more information about how we use your data see our Privacy Policy. The demonstration was clearly large in scale, and reported by some to be the largest “nationalist rally” in recent times. It’s hard to precisely measure crowd sizes at non-ticketed events and we often see attendance figures at large protests disputed. But the three million estimate appears to be far too high, based on both the police figures and analysis from independent crowd size experts who spoke to Full Fact. Dr G Keith Still, visiting professor of crowd science at the University of Suffolk, and the University of Melbourne’s Professor Milhad Haghani, founder of the Crowd Safety Summit, both told Full Fact that they believed three million was a substantial overestimate. A spokesperson for the MPS told Full Fact that its crowd estimates are based on a number of sources, including officers on the ground, CCTV and helicopter footage. The force said it also uses data based on its experience of previous events to estimate numbers. The largest political demonstration in British history is thought to have been the “Stop the War” protest which took place in London in February 2003. This event, which aimed to deter the UK from joining the war against Iraq, had an estimated attendance of between one and two million people, according to its organisers, with police estimating a crowd of around 750,000. We’ve written previously about claims about crowd sizes at other marches and protests. Before sharing content that you see online, first consider whether it comes from a trustworthy and verifiable source. Update 19 September 2025 We’ve added a line summarising further analysis from two independent crowd size experts. Tags Social media London Unite the Kingdom march Flags This article is part of our work fact checking potentially false pictures, videos and stories on Facebook. You can read more about this—and find out how to report Facebook content—here. For the purposes of that scheme, we’ve rated this claim as false Because the official police estimate was that between 110,000 and 150,000 people attended. Was this helpful? 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