Photo by Alishia Abodunde/Getty Images If a leadership contest is imminent, who would the Labour left throw its weight behind? That is the question MPs in the Socialist Campaign Group are currently mulling over. The parliamentary caucus was founded in the wake of Tony Benn’s 1981 deputy leadership bid, and now faces another moment of uncertainty at the top of the party. One person it won’t be is Wes Streeting. As I reported earlier this week, hard-left Labour MPs are furious at Streeting for using a moment when the Prime Minister might have been forced into setting an orderly departure timetable to advance his own leadership ambitions. On Wednesday afternoon (13 May), shortly after allies of Streeting briefed plans for him to resign and launch a bid the following morning, a source on Labour’s left told me: “He’s showing himself to be the self-centred person he really is.…