The Investigatory Powers Commissioner's Office discovered that MI5 repeatedly lied to judges and regulators about adhering to its strict secrecy stance regarding a violent informant known as agent X. To shield the domestic operative following an alleged machete attack on his partner, a senior officer breached policy with a reporter before lying to investigators and resigning. The report also established that agent-related operational errors at MI5 escalated dramatically from four cases in 2017 to 21 instances in 2025. The High Court will now evaluate potential disciplinary or legal action against the intelligence service and involved personnel.
Key points
The High Court will determine what punitive or administrative action to take against the…: The High Court will determine what punitive or administrative action to take against the security service and its personnel.
Watchdog scrutiny revealed wider state failings, including the National Crime Agency ille…: Watchdog scrutiny revealed wider state failings, including the National Crime Agency illegally tasking an unprotected child informant with criminal conduct.
Surveillance agency GCHQ raised major security alarms after failing to account for thousa…: Surveillance agency GCHQ raised major security alarms after failing to account for thousands of portable hard drives and memory cards.
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The man responsible for overseeing the conduct of the UK's intelligence services has said that MI5 lying to multiple courts while defending a violent neo-Nazi spy is as "serious as anything" he has ever dealt with.
"Oversight depends on candour," said investigatory powers commissioner Lord Leveson. "Failings of candour undermine the entire basis of oversight and accountability."
His office, the Investigatory Powers Commissioner's Office (IPCO), investigated how MI5 gave false evidence to three courts concerning the abusive informant known as agent X, as first exposed by the BBC.
IPCO's report, released earlier this year, found one senior officer lied repeatedly while another misled his own colleagues and lied about what he was told.
It also criticised other senior spies and found "serious and systemic failures in MI5's conduct" throughout the case.
MI5 said it accepted the report's findings "without reservation" last month. The High Court is due to decide soon on what action, if any, to take against the agency or its staff.
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