On 9 May 2026, the Foreign, Commonwealth and Development Office said the Chinese ambassador had been summoned on Friday 8 May on the instruction of the Foreign Secretary. The department tied that step directly to the conclusion of a criminal case that ended in convictions under the National Security Act and said the UK would not accept attempts by foreign states to intimidate, harass or harm people in Britain. (gov.uk) According to the FCDO, the conduct at issue was treated not simply as criminal wrongdoing but as a breach of UK sovereignty. In policy terms, that places the episode in the category of state-threat activity rather than routine diplomatic friction. (gov.uk)
Earlier, on 7 May 2026, the Crown Prosecution Service said Chung Biu Yuen and Chi Leung Wai had been convicted at the Old Bailey of assisting a foreign intelligence service under section 3 of the National Security Act 2023. The CPS said the case concerned unauthorised information-gathering and unlawful surveillance in the UK for the benefit of Hong Kong authorities and the Chinese state, and that Wai was also convicted of misconduct in public office after misusing Home Office computer systems. (cps.gov.uk) The CPS said Chung was a former Hong Kong police officer working at the Hong Kong Economic and Trade Office in London, while Wai was a former UK Border Force officer and special constable with the City of London Police. Prosecutors told the jury that the Hong Kong office was used as a base from which the activities were organised and funded, and that dissidents in the UK were researched for details such as vehicles, addresses and social media accounts. (cps.gov.uk)
The legislation point is central to the wider policy reading. Explanatory notes to the National Security Act say section 3 creates offences of assisting a foreign intelligence service, including by providing services, financial benefits or information that would materially assist UK-related activity. (legislation.gov.uk) In the Hong Kong surveillance case, the jury did not reach verdicts on the separate section 13 foreign interference counts, but the section 3 convictions were secured. The result shows that the Act can already be used against covert surveillance and information-gathering conducted in Britain for the benefit of an overseas authority. (cps.gov.uk)
The government has also built a separate policy language around transnational repression. Home Office guidance published in May 2025 says the term covers crimes directed by foreign states against individuals, including harassment, surveillance, stalking, threats of violence, attempts to force return and assassination attempts. (gov.uk) That is why the FCDO statement reads as more than a routine diplomatic note. It aligns the convictions with a standing national-security problem already identified by ministers, and it turns a completed prosecution into a direct warning that activity of this kind on UK soil will prompt a state response as well as a criminal one. This is an inference from the published guidance and the summons itself. (gov.uk)
Official reporting on Hong Kong had already pointed in the same direction. In its six-monthly report covering 1 January to 30 June 2025, the UK government said some activists facing Hong Kong arrest warrants and bounties were targeted through threatening letters sent to their UK neighbours, and that the matter was referred to UK police. (gov.uk) The summons therefore sits within an existing record of concern about the safety of Hong Kong campaigners and diaspora communities in Britain. For public bodies, universities and employers, the practical message is that suspicious approaches, surveillance or data misuse connected to foreign-state interests are now more likely to be treated through the state-threat and policing arrangements created around the National Security Act and transnational repression guidance. This is an inference from the government documents. (gov.uk)
The diplomatic context is not straightforward. The government’s Trade Strategy says the UK will pursue economic opportunities with China while recognising that the first duty of government is to protect security, and Downing Street said in January 2026 that it wanted a consistent, pragmatic relationship with Beijing while maintaining national-security guardrails. (gov.uk) Taken together, those documents suggest a two-track approach: engagement where ministers judge it to be in the national interest, and a firmer line where conduct in the UK is seen as coercive, covert or directed at people living here. The FCDO summons does not end wider contact with China, but it does show that a National Security Act case can move quickly from the courtroom into formal diplomatic action. This is an inference from the published policy material and the FCDO statement. (gov.uk)