Keir Starmer has unequivocally condemned the far-right protesters who leveraged the English flag to incite violence and fear during Saturday's 'Unite the Kingdom' rally in London. Starmer declared that Britain would "never surrender" to such elements, asserting that the St George’s flag truly represents a diverse nation and that intimidation based on background or skin colour would not be tolerated. He emphasized the fundamental right to peaceful protest but drew a clear line against violence, intimidation, and the appropriation of national symbols by anti-immigration extremists.

The rally, organized by the prominent far-right activist Tommy Robinson (Stephen Yaxley-Lennon), drew an estimated 110,000 to 150,000 attendees. Among the speakers was billionaire X owner Elon Musk, who delivered a controversial address via video link, stating that "violence is coming" and advocating for a "change of government in Britain," including a "dissolution of parliament and a new vote." Musk further claimed that "massive uncontrolled migration" was contributing to the "destruction of Britain." Other speakers included former Reform UK deputy leader Ben Habib, who is establishing a new party called Advance UK, which Robinson claims to have joined. Notably absent were promised speakers Steve Bannon and Jordan Peterson.

The protest was marred by significant disorder, resulting in 26 police officers being injured in clashes where projectiles were hurled. The Metropolitan Police reported 24 arrests for various offences, including common assault and violent disorder, and confirmed an ongoing post-event investigation to identify and apprehend additional individuals involved in the unrest. A major focus of this investigation is the search for a man whose on-camera comments, published online, called for Keir Starmer to be "assassinated" and "shot." Those arrested ranged in age from 19 to 58, with an average age of 39, and included three women.

Starmer's forthright denunciation was seen as a move to reassure Labour members who had expressed concern about the government's response to rising right-wing extremism. However, political reactions to the protest varied. Business Secretary Peter Kyle described the turnout as a "klaxon call" for the government to address public concerns, particularly regarding immigration, acknowledging a "sense of disquiet and grievance" within society which figures like Robinson exploit, linking these sentiments to the fallout from the financial crisis. In contrast, Labour MP Stella Creasy disagreed with Kyle's framing, tweeting that while the right to protest should be defended, the event's underlying purpose for many watching was fear, not freedom. Liberal Democrat leader Ed Davey urged politicians from all parties to condemn Elon Musk's "deeply dangerous and irresponsible rhetoric," calling for unity against attempts to undermine democracy.

The 'Unite the Kingdom' rally was met by a smaller counter-protest organized by Stand Up to Racism, which estimated its attendance at 15,000 to 20,000. Counter-protesters reported assaults and being hit by projectiles, and police had to intervene when Robinson's supporters blocked opposing protesters. The counter-extremism group Hope Not Hate characterized the event as Britain’s largest ever far-right protest, highlighting the extreme rhetoric voiced, which included calls for banning all public expression of non-Christian religions, demands for 'remigration' of legal migrants, Covid conspiracy theories, and claims of Britain being 'invaded' and its population 'replaced'.