A fresh row over Brexit has flared as Keir Starmer’s government prepares to return to Westminster, exposing divisions among the contenders positioning themselves to replace him. Wes Streeting, who stepped down as health secretary last week, indicated he wants Britain to rejoin the EU as he declared he would enter any Labour leadership race. Allies of Andy Burnham are said to be enraged by Mr Streeting’s move, with the Times reporting they see it as a calculated effort to thrust Brexit back to the forefront in the…