Jeremy Corbyn has said Sir Keir Starmer has “denigrated the democratic foundations” of Labour by taking forward plans to block the former leader from standing for the party at the next UK general election. Mr Starmer will on Tuesday propose a motion at a meeting of Labour’s ruling body that will make clear that the National Executive Committee (NEC) will not endorse Mr Corbyn at the next election, expected in around 18 months’ time. The Labour leader had ruled out the left-wing veteran standing again for Labour last month, as he insisted the party has undergone a transformation under his...