Rishi Sunak had his wife introduce him. Liz Truss spent the whole time scrapping budget measures announced only days before. What will U.K. Prime Minister Keir Starmer do at his annual party conference speech to reverse his own political fortunes? Typically, there is a crowd-pleasing announcement and on Tuesday, Labour members hope the big reveal will be generous handouts to parents. He will tell the conference floor that Britain faces a defining choice.