Panorama - Next Stop, Downing Street?

David Cameron has transformed the Conservative Party from unelectable and out of touch to runaway leaders in the race to be the next Government, but can he convince us he understands modern Britain? The BBC's political editor, Nick Robinson, takes him to Birmingham - site of the Conservative Party's annual conference - to meet some undecided voters. Can he persuade them he's got what it takes to be Prime Minister?