"MI5 court evidence based on lies, report says." That is how the BBC headlined the biggest vindication in its recent history. * Read it again. Evidence based on lies. The lies are simply there — a quality the evidence happens to have, like a coat of paint. Nobody told them. And then "report says," in case you were getting ideas. * The Guardian's headline on the identical report: "MI5 lied about relations with neo-Nazi informant, watchdog says." Somebody lied. That somebody is MI5. It took the Guardian six words. * The background, briefly: the deputy investigatory powers commissioner Sir John Goldring found MI5 gave false evidence to three courts while defending Agent X — a neo-Nazi informant who coercively controlled his partner, known as Beth, and attacked her with a machete. * Here is what makes the BBC's headline remarkable rather than merely cautious: the BBC is not a bystander to this story. The BBC's own reporter broke it. The government hauled the BBC into court in 2022 trying to block the investigation. MI5 then told three separate judges it had never revealed X's agent status to anyone — including, specifically, the BBC journalist investigating him. That was the lie. The reporter had a recording of the call. * So a state security service told courts, in a sworn statement, that a BBC journalist was wrong. Two internal inquiries then cleared MI5 and put the false evidence down to mistakes and poor memories. High court judges found those inquiries had "serious procedural deficiencies" and said "we cannot rely on their conclusions." Ten months later, Goldring reports that one senior officer told "lies" which "formed the foundation of MI5's false account," and that he put forward "a wholly fictitious account." * The BBC won, completely. Its article knows it. The body is written in the first person, it lays out every finding, and it lands on "serious and systemic failures in MI5's conduct." It is genuinely excellent reporting. * Then the headline turns up wearing a cardigan. * Look, the instinct is understandable. The BBC is an interested party, and an interested party running a victory lap looks self-serving. Restraint is the professional move. The question is who pays for it. * Because the person MI5's lie actually cost isn't the BBC. It's Beth. The courts believed MI5, so she was banned from ever officially being told X was an agent, denied the key evidence, left at "a serious disadvantage" and — this is the BBC's own copy — she "may have lost the case" because of it. "Institutions like MI5 always protect their own," she said on Thursday. * A headline that dissolves the liar into a property of the evidence makes it that much harder to see why her sentence is the most important one on the page. The Guardian had no stake in this fight, no reporter to defend, nothing to prove. It still found a subject for the verb.