UK PM Keir Starmer has resigned, and ex-Manchester mayor Andy Burnham is favoured to take over role. Some commentary has  focused on the role of charisma in the rise  as a determinant of political success and in this edition of The Conversation Hour we ask  how much charisma, authenticity and conviction  sway who you vote for. Also  in this edition, the broader impacts of bird flu on wildlife in Australia. Plus, the legacy of music executive Clive Davis who has died aged 94.