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.
More top news
One person has been confirmed dead and several are injured in the ongoing incident in Las Ramblas.
A number of fatalities and several injuries have been reported after a van has crashed into people in the Ramblas area of Barcelona.
John Underhill said geological changes 55 million years ago mean the UK's geology is unsuitable for shale oil and gas production.