The convictions handed down at the Old Bailey this week mark one of the most striking espionage cases to emerge in Britain in recent years, exposing what prosecutors described as a covert campaign of intimidation and surveillance directed at Hong Kong dissidents living in the United Kingdom.
Two men — Chung Biu “Bill” Yuen, a former Hong Kong police officer, and Chi Leung “Peter” Wai, a serving British Border Force official — were found guilty of spying on behalf of Hong Kong authorities and, ultimately, China. Prosecutors said the pair targeted pro-democracy activists who had fled Hong Kong after Beijing’s sweeping national security crackdown.
The case has sent fresh tremors through Westminster and Whitehall, reigniting concerns that Britain has become a battleground for what security officials increasingly describe as “transnational repression” — the pursuit and intimidation of dissidents abroad by authoritarian states.
Jurors heard that the men conducted surveillance operations between late 2023 and May 2024, monitoring prominent exiled Hong Kong activists, including Nathan Law, one of the best-known faces of the city’s democracy movement. Hong Kong authorities had previously placed bounties on several activists living overseas, including those in Britain.
The prosecution alleged the operation amounted to “shadow policing”, with Yuen acting as the link between Hong Kong officials and Wai, who exploited his position within Britain’s Border Force to obtain sensitive information. Wai was also convicted of misconduct in public office after improperly accessing government databases.
Perhaps most chilling were details surrounding an alleged attempt to gain entry to the home of a female dissident in West Yorkshire. Prosecutors told the court that operatives posed as maintenance workers in what appeared to be an intimidation exercise designed to frighten activists into silence. The jury could not reach a verdict on a separate charge linked to the incident.
The convictions are believed to be the first successful prosecutions under Britain’s new National Security Act involving Chinese espionage activity. They come at a moment of intensifying diplomatic strain between London and Beijing, particularly over Hong Kong, the former British colony returned to Chinese rule in 1997.
Relations between the two countries deteriorated sharply after Beijing imposed the Hong Kong National Security Law in 2020 following the mass pro-democracy protests that engulfed the territory in 2019. Critics say the law effectively dismantled the city’s political freedoms and judicial independence, prompting tens of thousands of Hong Kongers to seek refuge overseas, many of them in Britain.
Successive British governments have condemned the crackdown, arguing that China breached the terms of the Sino-British Joint Declaration. Beijing has repeatedly rejected such criticism, insisting that Hong Kong’s affairs are an internal matter.
The latest case is likely to deepen that confrontation. Following the verdicts, the British government announced it would summon the Chinese ambassador, with Security Minister Dan Jarvis declaring that foreign interference on British soil would “not be tolerated”.
China, meanwhile, responded furiously. Its embassy in London denounced the proceedings as politically motivated and accused Britain of attempting to undermine Beijing under the guise of national security concerns. Hong Kong authorities also denied any direct involvement by the city’s London trade office, where Yuen had been employed.
For many Hong Kong activists now living in Britain, however, the trial merely confirmed what they have long suspected: that distance offers only limited protection from Beijing’s reach.
Campaigners have repeatedly warned of harassment, surveillance and intimidation directed at dissidents abroad. British intelligence agencies have also become increasingly vocal about what they regard as sophisticated Chinese influence and espionage operations targeting politicians, academics, journalists and activists.
The atmosphere of fear surrounding the Hong Kong diaspora has only intensified following the imprisonment of leading democracy figures back in the territory itself. Media tycoon and activist Jimmy Lai was sentenced earlier this year to 20 years in prison under national security charges, a case condemned internationally as emblematic of Hong Kong’s collapsing freedoms.
The espionage trial was also overshadowed by the mysterious death of a third defendant, former Royal Marine Matthew Trickett, who was found dead last year after being charged alongside Yuen and Wai. Authorities have not publicly suggested foul play, but the circumstances added a layer of intrigue and unease to an already extraordinary case.
Sentencing for the two convicted men is expected later this year, with both facing the prospect of lengthy prison terms of up to 14 years.
Yet beyond the courtroom, the verdict may prove significant for another reason: it signals that Britain is finally beginning to confront publicly what security officials have privately warned for years — that geopolitical rivalries are no longer confined to distant capitals, but are increasingly being fought out in Britain’s streets, communities and institutions.
