If not the Tories, why Labour?

Keir Starmer's leadership speech today in Liverpool didn't get off to the best start after a protestor ran onto the stage and dumped glitter all over him. But after dusting himself down and rolling up his sleeves, the leader of the opposition set about addressing the question that many prospective voters have wanted answering: If not them, why us? He made big promises on the NHS and pledged to 'bulldoze through' the obstacles to growth caused by the planning system, including with a new generation of new towns. It was one of his best speeches yet, but can they deliver?  Katy Balls and Isabel Hardman discuss.