The singer James Blunt has been scolded by the producers of Celebrity Traitors after breaking one of the BBC's strictest rules, in a minor controversy that offered viewers a glimpse of the corporation's famously rigid compliance culture.

Before Celebrity Traitors began airing, Blunt posted the show's promotional photograph of himself on X, adding the caption: The name's Blunt. James Blunt. The post included a link to the X account of the company that made the suit he wears in the photograph, a bespoke tailor whose made-to-order outfit was reported to cost around £1,728.

The BBC is subject to stringent rules about promoting commercial brands. It appears the producers were not pleased that the post used Celebrity Traitors to draw attention to a commercial product. A BBC spokesperson told the press that the corporation had clear guidelines in place around commercial activity which it took very seriously, and that the players had been reminded of them. The social media posts in question were taken down.

The managing director of the tailoring firm told the Daily Mail that Blunt did not have any form of brand deal with the company and had not committed to wearing the outfit on the show. He declined to say whether Blunt had bought the suit or received it as a gift, saying he would not discuss such matters for any customer.

The cast of Celebrity Traitors are subject to strict rules about their outfits. Participants in BBC shows cannot wear clothes bearing logos or slogans that viewers could find offensive, and their wardrobes are typically agreed in advance. The actor Richard E. Grant, a fellow contestant, explained on television that participants were prescribed on a daily basis what they had to wear, with everything settled in advance, describing the experience as infantilising and institutionalising at the same time.

The episode was a light-hearted footnote to the launch of Celebrity Traitors, the star-studded spin-off of the hit reality format, but it underlined how seriously the BBC takes its impartiality and anti-commercialisation rules. The corporation's guidelines exist to prevent licence-fee-funded programmes from becoming vehicles for product placement, and breaches, however inadvertent, are treated as matters of editorial integrity.

Blunt, the former army officer turned chart-topping singer-songwriter behind You're Beautiful, has in recent years reinvented himself as one of British music's wittiest social media personalities, famous for his self-deprecating put-downs of online critics. On this occasion, it was the BBC doing the telling-off, and the singer duly deleted the offending posts.