Ex-MI5 Contractor Accused of Leaking Secrets to Foreign Power

Juan Joseph, 43, a former IT contractor for the UK’s MI5 intelligence agency, is on trial at the Vintage Bailey accused of breaching the Official Secrets Act and the National Security Acts. He allegedly passed sensitive information to a foreign power and attempted to arrange a meeting with its representatives in Latvia.

Details of the Case

The prosecution alleges that Joseph sent emails containing information damaging to UK national interests to bodies representing one or more foreign countries in late 2024 and early 2025 . He then traveled to Riga, Latvia, and attempted to meet with representatives of a foreign embassy .

Background of the Accused

Joseph worked as an IT contractor for MI5 from September 2009 until October 30, 2020 . He held the highest level of security clearance, known as “Developed Vetting,” granting him access to highly classified information . His contract was terminated after he began exhibiting signs of mental health problems in 2020 .

Claims of Mistreatment and Training

During police interviews, Joseph claimed he was a “whistleblower” and maintained he had not acted maliciously . He also alleged he underwent “ninja-style” training at MI5 headquarters, Thames House, involving swords and knives . He further claimed to have been the victim of racial abuse and a needle attack while employed by MI5, resulting in a heart condition .

Ongoing Trial and Restrictions

The trial is being held at the Old Bailey, with parts of the proceedings taking place behind closed doors due to national security concerns . Jurors have been instructed not to discuss the closed proceedings with anyone, even after the trial concludes . Joseph denies four charges under the Official Secrets Act and National Security Act, as well as a charge related to possessing a lock knife .