On a crisp March morning in London’s legal quarter, two men accused of espionage appeared in the dock of the Old Bailey amid intense media scrutiny and diplomatic posturing.
Their alleged crime — carried out on British soil, against residents of the country — has brought into sharp relief debates about foreign influence, national security and the uneasy diplomacy at the heart of Britain’s relationship with China and Hong Kong.
Chung Biu Yuen, 65, a retired Hong Kong police superintendent, and Chi Leung “Peter” Wai, 38, a former UK Border Force officer and special constable with the City of London Police, stand accused of conducting clandestine surveillance on individuals who left Hong Kong following the imposition of a stringent national security regime there. Both men, who hold dual British and Chinese nationality, have denied the charges brought under the United Kingdom’s National Security Act.
At the centre of the prosecution’s case, as outlined by Duncan Atkinson KC, is what he described in court as a series of “shadow policing operations on behalf of the Hong Kong Special Administrative Region and thereby the People’s Republic of China.” The defendants are charged with assisting a foreign intelligence service between December 2023 and May 2024, in part through surveillance activities directed at well-known émigré activists now living in the UK.
The principal alleged target has been Nathan Law, the high-profile pro-democracy campaigner who escaped Hong Kong in 2020 and has since become a vocal critic of Beijing’s tightening grip on the former British colony. Prosecutors told the court that messages extracted from Mr Yuen’s phone showed surveillance of Mr Law dating back to 2021, reflecting a persistent interest by the defendants, at the behest of their contacts, in monitoring dissidents whose work has drawn the ire of Hong Kong authorities.
Evidence submitted by the Crown also alleges that the pair gathered information on other individuals regarded as “persons of interest” by Hong Kong, including Monica Kwong, who relocated to the UK after being accused of fraud at home. Alongside routine observation, Mr Atkinson told jurors that the defendants went so far as to devise a ruse to gain entry to Ms Kwong’s residence in Pontefract in northern England, posing as electricians and employing deception to cross the threshold.
The alleged misuse of British identity and access is a particularly striking element of the case. Mr Wai, prosecutors assert, used his position within UK law enforcement to obtain sensitive information from databases unavailable to ordinary citizens — an act that, if proven, would deepen the legal and symbolic breach at the core of the accusations.
Facing these allegations, the defendants have pleaded not guilty. Their lawyers have signalled intentions to contest both the factual basis and legal interpretation of the charges, framing their activities, in part, as legitimate community outreach or administrative functions. Detailed defence submissions have yet to be heard publicly, with the trial expected to extend over several weeks.
The Chinese Embassy in London has reacted sharply, branding the case “fabricated” and asserting that the British authorities have no jurisdiction to comment on Hong Kong’s legal affairs. “These accusations are baseless,” a spokesperson told visiting journalists, adding that the alleged acts predate any formal UK designation of China as a security threat.
For ministers in Westminster, the case presents a diplomatic calculus. Prime Minister Sir Keir Starmer’s recent efforts to restore warmer trade and investment ties with Beijing — including approving plans for China to construct its largest diplomatic mission in Europe — have been delicately balanced against concerns over espionage, intellectual property theft and foreign interference in British public life.
This trial follows other episodes that have strained UK-China relations on security grounds. Last year, a separate espionage case fell apart when prosecutors were unable to proceed without unequivocally classifying China as an “enemy” under British law, highlighting gaps in the legal architecture governing foreign intelligence threats. And more recently, Westminster was jolted by the arrest of individuals, including partners of sitting and former MPs, on suspicion of spying for China — developments that have fuelled scepticism across party lines about the scale of espionage activity.
Legal experts say the outcome of the Old Bailey proceedings could have repercussions well beyond the fate of the two men in the dock. It is one of the few high-visibility cases to test the provisions of the National Security Act since its enactment, and its contours will inform debates about how Britain defines and prosecutes foreign interference in an age of transnational digital communication and diaspora activism.
For the Chinese diaspora in London and elsewhere in the UK, the trial is already a source of anxiety. Community leaders warn that conflating legitimate political expression with espionage risks alienating people who fled repression in Hong Kong or elsewhere. “There must be a clear line between lawful political engagement and unlawful acts,” said one human rights advocate, speaking on condition of anonymity. “The rule of law demands it.”
As the case unfolds, it will provide more than legal answers; it will offer a vivid lens into the strains and contradictions of a world in which global cities like London host both political refuges and geopolitical contestations.
