MI5 is under intense scrutiny after a High Court judge declared he had “no confidence” in the Security Service’s account of how a senior officer delivered false evidence in a high-stakes legal battle involving a violent neo-Nazi agent.
Ahead of a critical hearing on Tuesday, Mr Justice Chamberlain ordered MI5 to disclose secret documents, including an internal investigation and policy materials, after raising serious doubts about the truthfulness and transparency of the agency’s previous disclosures.
The case centres on MI5’s handling of a covert agent, known only as “X,” who used his intelligence role to abuse and terrorise his partner—once attacking her with a machete. The Security Service has been accused of misleading multiple courts about the agent’s status, even while privately confirming his identity to a journalist investigating the matter.
In 2022, then-Attorney General Suella Braverman secured an injunction to protect the agent’s anonymity but failed to prevent the underlying story from being made public. During those proceedings, a senior MI5 officer—Witness A—asserted that the agency had strictly adhered to its “neither confirm nor deny” (NCND) policy. That assertion has since been proven false: MI5 had, in fact, disclosed the agent’s status during private calls.
In recent hearings, Mr Justice Chamberlain voiced grave concern about the integrity of the evidence submitted. He pointed to discrepancies between open and closed versions of internal reviews and questioned whether the court had been given a full and accurate picture of the events.
Among his findings:
- Secret documents included “potentially significant material” omitted from public versions.
- These omissions “raise real questions” about the reliability of Witness B’s summaries.
- The judge has “no confidence” that the court has been fully informed of how false evidence was initially provided.
- He also raised new concerns about the “correctness” of Witness B’s more recent testimony.
The fallout could be significant. A panel of senior judges—including the Lady Chief Justice, Baroness Sue Carr, and Dame Victoria Sharp—will now determine whether MI5 or individual officers should face contempt of court proceedings or other disciplinary actions.
Adding further complexity, the Attorney General, Lord Hermer—ordinarily responsible for referring contempt matters—is representing MI5 in this case, creating a potential conflict of interest.
The court is also set to examine whether MI5 may continue relying on its NCND policy in legal proceedings concerning “Beth,” the former partner of agent X. That policy has so far restricted her access to key material, with crucial evidence confined to closed hearings in which her lawyers are excluded.
Tuesday’s hearing may also lead to the release of more details from MI5’s internal investigations, previously kept from public view.
With the credibility of Britain’s domestic intelligence service now under question, the court must decide whether to impose consequences for the false evidence—and whether national security can still be used to shield misconduct.
