Richard Osman has spoken out about the Celebrity Traitors cast as he confirmed the stars that are "missing" from the line-up. Filming for the highly anticipated spin-off commenced this week at Ardross Castle in the Scottish Highlands, where a group of celebrities will engage in a game of deception. Several stars were spotted arriving at Inverness Airport last week, including Jonathan Ross, Tom Daley, Charlotte Church, Stephen Fry, Alan Carr, and David Olusoga. Other famous faces that are expected to feature on the new series are Good Morning Britain host Kate Garraway, rugby star Joe Marler, YouTuber Niko Omilana and Line of Duty actor Mark Bonnar. The line-up also features comedians Joe Wilkinson and Lucy Beaumont, presenter Clare Balding, EastEnders actress Tameka Empson, and acclaimed actresses Celia Imrie and Ruth Codd, reports OK! During his podcast, The Rest Is Entertainment, co-hosted with Marina Hyde, Richard Osman commented on the reported line-up, stating that it is "not" the official list. "I keep reading that the official list of participants has been released. It has not," he clarified. "There are lists out there which I don't think were a million miles off the truth, but the official list is yet to be announced." "And there are people who are going to be in this who are not on the list I've seen as well... I can neither confirm nor deny who is going to be in it, who's not going to be in it," Richard added, while also confirming that he will not be participating in the show. Discussing the anticipated air date, the host then remarked: "You would assume that the regular Traitors will be in its usual slot in January, so you would have thought it would be late September, early October, something like that. But certainly they're filming as we speak." The news follows reports that the BBC has implemented stringent regulations on the set of the popular reality series. The Sun reports that the broadcaster has seized the celebrities' mobile phones and assigned security to monitor the stars to prevent any pre-filming collusion. "The BBC aren't taking any chances with the contestants - even though they're household names," a source disclosed to the publication. "They are all holed up in a hotel together but they are being kept apart with a security guard on their floor at all times to make sure they're not swapping tactics or talking. "In the normal series of The Traitors, the contestants' phones are removed and there have been no special measures put in place for the celebs." The insider added: "The BBC want this series to be as explosive as ever, so they won't allow any collusion." Celebrity Traitors will air on BBC One later this year