Celebrity Traitors has been thrown into chaos after reports claimed the identities of this series' finalists were leaked by a friend of one of the players, just as Friday's episode drew a reported 9.6 million viewers for the BBC.

The claim, reported by The Sun and picked up widely over the weekend, suggests that word of who survives to the end of the game has been circulating at showbusiness parties despite the extraordinary secrecy surrounding filming at Ardross Castle. Contestants signed lengthy non-disclosure agreements before filming, with Ross Kemp joking that his was longer than the Bayeux Tapestry.

Producers have gone to unusual lengths to protect the outcome. Players were kept apart, results were closely guarded, and even interview schedules around the final are said to have fuelled speculation about who lasted longest. That makes any leak especially damaging for a format whose entire appeal rests on viewers not knowing who to trust.

The second celebrity series has become a genuine ratings phenomenon. Its opening episodes drew audiences well above the first celebrity run, and moments from the castle — including an early, accidental confession by one Traitor — have dominated social media discussion. The BBC has declined to comment on the reported leak.

For the broadcaster, the risk is practical as well as dramatic. Spoilers spread quickly through gossip forums and group chats, and once a result is widely believed to be known, some viewers drift away. Production sources quoted in reports said the hope was that anyone who hears the rumoured outcome will keep it to themselves.

The leak row also underlines how valuable the format has become. A celebrity edition that can command close to ten million viewers is a rare asset in modern British television, which is why so much effort goes into protecting its secrets. Whether the rumours prove accurate will only become clear when the final episodes air.

Until then, the programme faces an awkward tension: the more successful it becomes, the harder its secrets are to keep. Cast members have spoken openly about how seriously they took their contracts, and several have described deliberately misleading friends and family about how long they stayed in the castle.

The episode also shows the double-edged nature of modern reality television fame. The same social media buzz that drives record audiences makes secrets almost impossible to contain, because every cast member's friends, family and followers become potential sources. Show bosses across the industry have responded with tighter contracts, staggered filming and deliberate misdirection, yet leaks keep happening. For the BBC, the coming weeks will test whether suspense can survive the rumour mill — and whether viewers who think they already know the ending will keep watching a story whose pleasure lies in uncertainty.