Britain's domestic security service has acknowledged that it submitted evidence based on falsehoods to three separate courts and that senior officers engaged in repeated dishonesty. The admission marks the first time MI5 has formally accepted that untrue statements were made to judges while defending a violent neo-Nazi informant whose pattern of abuse was exposed by investigative journalism.
The false evidence came to light following a national broadcaster's investigation published in February 2025, which the security service initially and vehemently rejected. Timothy Otty KC, acting as counsel for MI5, disclosed the service's changed position during proceedings at the High Court in London on Friday, 18 September 2026.
A bench of three senior judges—Baroness Sue Carr (England and Wales' most senior judge), Dame Victoria Sharp (President of the King's Bench Division) and Mr Justice Chamberlain—is now deliberating what consequences should follow. The panel must determine whether to launch contempt of court proceedings against specific MI5 officers or the organisation itself, a step that would be without precedent.
What did MI5 claim and what was the truth?
MI5 told the courts it had adhered strictly to its foundational secrecy protocol, known as 'neither confirm nor deny' (NCND), regarding the agent's status. Under this policy, the service maintains it neither confirms nor denies whether any individual works for it. The courts relied on these assurances to allow MI5 to withhold information from the woman abused by the agent, identified by the alias Beth.
In reality, MI5 had disclosed the man's role as an informant during telephone conversations in 2020, when officers contacted the journalist conducting the investigation to discourage scrutiny of the individual. The security service's actual conduct directly contradicted what it had sworn to the courts, leaving Beth and others without access to crucial evidence that could have strengthened her legal position.
What did the official investigation find?
A detailed inquiry led by Sir John Goldring, the then deputy investigatory powers commissioner, concluded that MI5 had engaged in systematic failures and dishonesty. The investigation, ordered by the prime minister in September 2025, identified one senior officer designated as Officer 2 as having lied repeatedly to the courts. A second officer, Officer 3, was found to have misled his own colleagues and provided false accounts of what he had been told.
The report documented what it characterised as "serious and systemic failures in MI5's conduct" spanning the entire case. Otty acknowledged that MI5 "fully accepts and acknowledges the gravity of the issues raised" and committed the organisation to ensuring such conduct never recurs.
What reforms has MI5 announced?
The security service has pledged a comprehensive reform programme under the direction of director general Sir Ken McCallum. Officer 2 has already resigned from the service, while Officer 3 has been suspended and faces disciplinary action that could result in dismissal.
Otty argued against pursuing contempt proceedings, contending that such action would not serve the public interest given the thoroughness of Sir John's investigation, MI5's public apologies, and its stated commitment to systemic change. Counsel for both officers similarly opposed contempt action.
Matthew Butt KC, representing Officer 2, submitted that the Goldring report itself constituted a sufficient response. He stated that his client accepted his behaviour had fallen below expected standards and expressed regret, though he disputed the finding that the officer had acted dishonestly or interfered with the administration of justice.
Aaron Watkins, counsel for Officer 3, offered an apology on the officer's behalf and conceded that his conduct "undoubtably" contributed to courts and parties being misled. However, he maintained that the officer had not acted dishonestly and argued that the evidence presented did not meet the threshold required for contempt proceedings. He further contended that such action would not be in the public interest, given that a thorough investigation had already taken place.
How did this case begin?
The central figure is a foreign national with neo-Nazi ideology and extreme misogynistic views who operated as an MI5 informant under the designation Agent X. He weaponised his position within the security service to coercively control his partner, Beth, subjecting her to violent attacks including an assault with a machete. Despite being under police investigation for abuse, MI5 facilitated his departure abroad to continue intelligence operations.
The government initiated legal action against the national broadcaster in 2022 in an unsuccessful attempt to suppress the investigation, though the courts granted the agent legal anonymity. Beth subsequently brought a claim against MI5 at the Investigatory Powers Tribunal. In 2024, she sought a judicial review of an earlier ruling at the High Court.
In all three proceedings, MI5 argued for secrecy by insisting it had consistently maintained its NCND policy and had never disclosed the man's agent status to anyone, including the journalist. A sworn statement from a senior officer designated Witness A reinforced this position to the judges. The courts accepted MI5's case, which meant Beth and the public were formally barred from being told the man was an agent and denied access to evidence that could have altered the outcome of her legal challenge.
How was the deception exposed?
Following the court decision in late 2024, the journalist publicly challenged MI5's account, asserting that the service had lied to the courts. MI5 initially maintained its position with vigour until confronted with documentary proof of its dishonesty, including a recording of one of the telephone conversations with Officer 2 in which the agent's status had been disclosed.
Two official inquiries that followed the broadcaster's revelations initially absolved MI5 and its officers of deliberate wrongdoing, attributing the false evidence to mistakes and lapses in memory. However, in July 2025, a panel of senior High Court judges rejected these explanations, ruling that the investigations carried out by MI5 suffered from "serious procedural deficiencies" and declaring that "we cannot rely on their conclusions". This judicial rebuke prompted the prime minister to commission Sir John Goldring's independent investigation.
What happens next?
The three senior judges will deliver their decision on whether to initiate contempt of court proceedings at a later date. Legal submissions from counsel representing the broadcaster were scheduled to be heard on 18 September 2026. Any contempt action would represent an unprecedented step in holding the security service or its officers accountable through the courts for providing false evidence.
Key Facts
- MI5 has formally accepted it provided false evidence to three courts regarding its adherence to its 'neither confirm nor deny' secrecy policy
- An independent investigation by Sir John Goldring found systematic failures and dishonesty by named officers, with one having resigned and another facing potential dismissal
- The deception prevented an abuse victim from accessing evidence that could have strengthened her legal case against the security service
- A panel of three senior judges is considering whether to bring unprecedented contempt of court proceedings against MI5 or individual officers
- The security service has committed to a major reform programme under its director general
