London witnessed a day of heightened political activity and significant police deployment on Saturday, as two major demonstrations – a far-right "Unite the Kingdom" march led by Tommy Robinson and a pro-Palestinian Nakba Day rally – took place concurrently with the FA Cup Final. The Metropolitan Police reported making 31 arrests across both events, while deploying approximately 4,000 officers, armored vehicles, dogs, drones, and helicopters to manage the crowds and prevent clashes, an operation estimated to cost £4.5 million.

The "Unite the Kingdom" rally, spearheaded by far-right activist Stephen Yaxley-Lennon, also known as Tommy Robinson, drew tens of thousands of supporters to Parliament Square. Organisers' claims of millions in attendance were contrasted by police estimates of around 60,000 demonstrators, a figure lower than the 150,000 who attended a similar march last September. Robinson declared the rally a "turning point for Britain" and urged his followers to engage in local politics and become activists before the 2029 general election, framing it as a crucial "battle of Britain" to prevent losing the country. The event was characterized by the distribution of Islamophobic and ethnonationalist hate speech and flyers, some advocating for "a future for white people." Many participants carried wooden crosses and chanted "Christ is king," alongside others wearing "make England great again" hats.

Prominent figures addressed Robinson's rally, including Siobhan Whyte, whose daughter Rhiannon was murdered by a Sudanese asylum seeker, who accused Labour leader Keir Starmer of failing her daughter and the country. Polish politician Dominik Tarczyński, who claimed Starmer banned him from entering the UK, addressed the crowd via video link, asserting that while he could be banned, the supporters could not be cancelled. Former Apprentice contestant and far-right commentator Katie Hopkins also sent a video message, expressing pride in the attendees and the reclaimed appearance of the capital. Support for X owner Elon Musk was also chanted, with Robinson crediting him for enabling the movement. Other speakers included television personality Ant Middleton, former actor Laurence Fox, and former Conservative MP Andrew Bridgen.

Simultaneously, a separate pro-Palestinian Nakba Day rally, organized by groups including Stand Up To Racism, gathered in west London and concluded near Piccadilly. This demonstration commemorated the expulsion of Palestinians in 1948 and featured banners with slogans such as "Bristol stands with Palestine," "Stop Trump, Stop Farage," and "Free Palestinian Hostages." Organisers estimated attendance at least a quarter of a million people, while police had anticipated around 30,000. Labour MPs Apsana Begum and Diane Abbott addressed the rally, with Abbott warning against a "common enemy" in the "far right," describing them as "viciously right-wing, viciously racist, anti-black, anti-Muslim, and viciously antisemitic." Former Labour leader Jeremy Corbyn also spoke, advocating for a change in "policy" rather than "personalities" in Westminster. Incidents at this rally included the arrest of a woman who refused to remove a fabric face mask and requests for a group wearing orange jumpsuits with Nigel Farage masks to remove their coverings.

The Metropolitan Police's extensive operation aimed to maintain order and prevent clashes between the opposing groups, particularly with football hooligan groups historically linked to Robinson potentially attending. Conditions were imposed on both rallies regarding routes and timings to keep rival attendees apart. As of 4:30 pm, 31 arrests had been made across both events, including two men wanted for grievous bodily harm and inciting an attack on a police officer, who were apprehended near Euston station while attempting to attend Robinson's rally. Despite the number of arrests, the Met stated that "both protests have proceeded largely without significant incident," while emphasizing a "zero-tolerance approach" and holding organisers legally responsible for hate speech from invited speakers.

The political backdrop to these protests was a period of "radicalized" British politics, with recent local elections showing advances for parties on both the far right and far left. Justice Secretary David Lammy condemned the "Unite the Kingdom" march organisers for "spreading hatred and division." Labour leader Keir Starmer accused Robinson's rally organisers of "peddling hatred and division" and warned that anyone causing "havoc" would face the "full force of the law." The government also blocked 11 foreign nationals, described by Starmer as "far-right agitators," from entering the UK ahead of the rally. Campaign groups like Hope Not Hate expressed deep concern over the scale of Robinson's movement, despite possibly stalled growth, calling it a "significant threat." Conversely, Led by Donkeys displayed a giant screen at the rally playing a video with the slogan: "Immigration makes Britain brilliant."