The BBC has several self-regulatory systems to ensure impartiality in news reporting, including programs where audiences can provide feedback. Regulator Ofcom oversees other UK broadcasters and requires balance and no favoring of viewpoints, especially regarding politics. The Ofcom Broadcasting Code mandates news be reported accurately and impartially. Significant mistakes must be acknowledged and corrected. Politicians cannot report news without editorial justification of their political views. Presenters cannot express views on political or industrial issues without alternative viewpoints.