Mayor of London Boris Johnson has said Lord Justice Leveson's imminent report on the future of press regulation should be taken "very seriously".
He told Murnaghan: "The present system has obviously failed and it doesn't carry confidence with the public at large."
He added that he did not want politicians influencing the media's agenda.
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Cast and crew from Coronation Street along with members of the public will attend the event at Manchester Cathedral to remember the actress.