The BBC's director general, George Entwistle, has resigned in the wake of the Newsnight child abuse broadcast.
In a statement given outside New Broadcasting House, Mr Entwistle said: "I have decided that the honourable thing to do is to step down."
Earlier, Mr Entwistle said the Newsnight report, which wrongly implicated ex-senior Tory Lord McAlpine should never have been broadcast.
In his statement, he said: "In the light of the fact that the director general is also the editor in chief and ultimately responsible for all content, and in the light of the unacceptable journalistic standards of the Newsnight film broadcast on Friday 2 November, I have decided that the honourable thing to do is to step down from the post of director general."
I said earlier today he'd have to go - his interview this morning showed he had made no effort to keep track of what the BBC was reporting in the middle of a crisis about BBC reporting, let alone control it. He was unaware that MacAlpine had threatened to sue the BBC for a whole day, despite it being reported in the news all over the place.