MEDIA regulator Ofcom has warned broadcasters to be vigilant about briefing guests on live TV shows in the wake of a four-letter outburst from a Tory MP during a lunchtime political programme.

Former prisons minister Nick Herbert used the term "f***wit" while appearing as a guest on BBC2's Daily Politics programme in May this year, which led to an apology from the corporation.

Ofcom received five complaints and investigated the incident as a possible breach of standards, but is not taking any further action over the broadcast.

Mr Herbert defended his actions at the time, pointing out he used the term "disapprovingly" while quoting from a disparaging comment he claimed had been made by a fellow guest, former police officer Peter Kirkham, in reference to Home Secretary Theresa May.

Presenter Jo Coburn upbraided Mr Herbert and later offered an apology to viewers.

Ofcom said it concluded that the matter had been resolved because of the presenter's swift intervention and apology, together with the fact it was unlikely children would be watching.

However, in a report it said: "Ofcom reminds all broadcasters they should consider carefully their processes for briefing guests appearing on live programmes."