Keir Starmer elected as Labour party leader - so, who is he?

First paragraph: Party leaders matter more than ever in today’s politics. They embody their parties in the public’s mind and, for many voters, assessing a leader is a cognitive shortcut simplifying the process of electoral choice. So, Keir Starmer’s election as the UK’s Labour party leader, defeating Rebecca Long-Bailey (the “continuity candidate”) and Lisa Nandy, will have a major effect on the party’s prospects for revival