OFCOM own rules article 5
Meaning of "due impartiality"
“Due” is an important qualification to the concept of impartiality. Impartiality itself means not favouring one side over another. “Due” means adequate or appropriate to the subject and nature of the programme. So “due impartiality” does not mean an equal division of time has to be given to every view, or that every argument and every facet of every argument has to be represented. The approach to due impartiality may vary according to the nature of the subject, the type of programme and channel, the likely expectation of the audience as to content, and the extent to which the content and approach is signalled to the audience. Context, as defined in
Section two: Harm and offence of the Code, is important.
Due impartiality and due accuracy in news
5.1: News, in whatever form, must be reported with due accuracy and presented with due impartiality.
5.2: Significant mistakes in news should normally be acknowledged and corrected on air quickly (or, in the case of BBC ODPS, corrected quickly). Corrections should be appropriately scheduled (or, in the case of BBC ODPS, appropriately signaled to viewers).
5.3: No politician may be used as a newsreader, interviewer or reporter in any news programmes unless, exceptionally, it is editorially justified. In that case, the political allegiance of that person must be made clear to the audience.