Here are the contenders to replace Starmer if he steps down as prime minister... Gordon Brown and Baroness Harman leave No10 after meeting with Keir Starmer Andy Burnham - The mayor of Greater Manchester has hinted at a leadership challenge for months, but he is currently unable to launch an official bid as he is not a sitting MP. Angela Rayner - Rayner resigned from Starmer’s cabinet last September after it emerged she had underpaid stamp duty on her Brighton flat, but she has been named as one of the MPs most likely to stage a coup against him. Wes Streeting - The current health secretary is seen as the most likely to replace Starmer from within his own cabinet and he is understood to have enough backing from Labour MPs to launch a leadership bid. Ed Miliband - Over 10 years on from leading Labour to defeat at the 2015 election, Miliband is back in the mix, and he has become increasingly critical of the government following the Mandelson scandal.…