The Metropolitan Police are investigating allegations that security guards at Chinese diplomatic premises in London used illegal electroshock weapons against protesters, prompting calls for the UK government to take a firmer stance. Video footage reportedly shows guards at both the current embassy on Portland Place and the proposed new embassy site at Royal Mint Court brandishing the banned devices during two separate incidents, according to the i Paper. Downing Street said it has raised the matter directly with the Chinese embassy and would "not hesitate to act" if evidence of a crime emerges, while stressing foreign diplomats must obey UK law. The Chinese embassy has dismissed the allegations concerning the Portland Place incident as fabrication by "Tibetan independence elements".

The Met confirmed it was called to a protest outside the Portland Place embassy on 3 July, after two protesters alleged staff had pointed a Taser at them; no injuries were reported and no arrests have been made, with officers reviewing witness video evidence. Shadow national security minister Alicia Kearns criticised the government's response as inadequate, calling the police probe a "dead end" unlikely to lead to prosecution due to diplomatic protections, and urged ministers to act rather than merely "raise" the issue with the embassy, warning inaction risked inviting further breaches.