In an email to staff after Mr Entwistle resigned, Lord Patten said the "priority now is to address the very serious questions that still remain around the original decision not to pursue the initial Newsnight investigation, how last week's story went so horribly wrong and, most importantly, how the BBC's historic culture and behaviour allowed Jimmy Savile to get away with his vile criminal activity".
BBC: needs 'radical overhaul', says Lord Patten