Channel 4 News' Cathy Newman interviews Sharon White as the Ofcom Chief Executive prepares to take on new responsibilities for the BBC and looks over a landscape in which UK people now spend more time on media and communications on average each day than they do sleeping. The challenges for the regulator have never been more intense: to protect the public's interests as both consumers and citizens, and to ensure the UK's communications industries continue to flourish in an ever more competitive and globalised world. She explains how Ofcom is doing.