Reports of a celebrity traitors final leak have put BBC bosses on edge. According to reporting by The Sun, someone close to one of the celebrities competing in season two of the show has claimed to know who makes it to the final, setting off a scramble at the broadcaster to keep the outcome under wraps.

The paper's October 10 report on the celebrity traitors final leak says the corporation is desperate for the result not to be spoiled, after 9.6 million viewers tuned in for Friday's episode. Filming wrapped earlier this year at Ardross Castle in the Scottish Highlands, and every contestant signed a non-disclosure agreement pledging to keep the outcome secret until the episodes air.

The season two lineup includes Bella Ramsay, Joe Lycett, James Acaster, Richard E Grant, Maya Jama, Michael Sheen, Miranda Hart and Leigh-Anne Pinnock, all under host Claudia Winkleman. The celebrity traitors final leak report also notes that players have been open about the lengths the BBC went to: Ross Kemp described the agreement as longer than the Bayeux Tapestry, and Lycett later told the Hits Radio Breakfast Show he had treated his own agreement loosely, ignoring the requirement to stay quiet until the official cast announcement. Fans of the companion show can catch up on Celebrity Traitors: Uncloaked's return with Ed Gamble.

A source close to the production told the paper that the leak has become a talking point at showbiz parties, where word has spread about which celebrities were still in the game when the cameras stopped rolling. The same source said a second trail of gossip has formed around which players have been lined up for interviews around the final, a detail that can give the game away to careful watchers.

The BBC is said to be hoping that anyone who hears the names keeps them to themselves, treating the celebrity traitors final leak as a confidence rather than a story to pass along. Only a small circle could know the answer: people who worked on the show, the celebrities who made it to the end, and their closest friends and family. The Sun on Sunday added that it would not publish further details, saying that spoiling the finale would be catastrophic for the broadcaster. The Daily Mail has contacted the BBC for comment.

Why the BBC guards the ending like state secrets

Reality television lives and dies on the gap between filming and broadcast, and few shows protect that gap as carefully as The Traitors. The celebrity edition sharpens the problem, because its players are famous enough that one unguarded interview or party conversation can undo months of secrecy. A celebrity traitors final leak lands differently from a script leak: when a cast member's friend reportedly starts talking, the damage is done long before anything airs.

The BBC has leaned on legal muscle to hold the line, with players signing agreements before heading to Ardross Castle and a history of moving fast when the line is crossed. The production team kept the game sealed through the spring filming in Scotland, but with the finale due at the end of the month, the number of people who know the outcome has only grown, and the celebrity traitors final leak shows what happens when one of them talks. More than one winner is possible this time, which gives the rumour mill even more to work with.

Last season's early upload still looms large

The latest celebrity traitors final leak is not the first time the ending has slipped out early. Last season, the full finale was briefly uploaded a day early on Crave, the Canadian streaming service that carries the programme there, and stayed up for around 90 minutes before being taken down. That was long enough for viewers on message boards to pass the result around. The BBC responded by urging fans not to share potential spoilers so everyone else could watch the final fresh. The episode still drew 11 million viewers in the UK, with comedian Alan Carr emerging victorious, but the incident left the broadcaster wary of a repeat. Coverage of last season's Crave incident shows how seriously the corporation takes spoiler containment.

That history explains why the reaction to the celebrity traitors final leak has been so swift. The Celebrity Traitors has become one of the BBC's biggest entertainment properties, and a blown finale would be the kind of wound that lingers. The original report is carried by The Sun, which says the corporation is now banking on discretion from the very circle it fears most.

For now, the BBC's best defence is the fans themselves. The broadcaster is betting that most viewers would rather ride out the last episodes blind than have the ending whispered to them at a party. What remains to be seen is whether the gossip stays contained to showbiz circles or reaches the forums and feeds where the show's most dedicated viewers spend their time, because a celebrity traitors final leak is hardest to contain once it gets there.