A retired Hong Kong police officer and Border Force official - who both held British passports - are accused of engaging in "shadow policing" in the UK on behalf of China, a court has heard.

Chung Biu "Bill" Yuen, 65, and Chi Leung "Peter" Wai, 38, are alleged to have carried out surveillance on Hong Kong pro-democracy campaigners claiming asylum in the UK.

They are charged with offences under the National Security Act.

Yuen is a former Hong Kong police officer who was working for the Hong Kong Economic and Trade Office in London, while Wai was working for the UK Border Force, was a volunteer Special Constable with the City of London Police and used to work for the Metropolitan Police.

They are accused of working with Matthew Trickett, a former British Royal Marine and UK Border Force officer, who was found dead in May 2024 after being released on bail.