Lord Patten, Chairman, BBC Trust

The BBC is the worlds biggest broadcaster. It has a proud history, but what about its future? Funding is being squeezed, the competition across all media platforms is intense and its role as a public service broadcaster is under constant scrutiny. Lord Patten is the Chairman of the Trust which oversees the BBC. The global media landscape is changing with extraordinary speed; can the BBC keep up? Lord Patten talks to Stephen Sackur.