By Simon Mullock Erik ten Hag has warned New Manchester United owner Sir Jim Ratcliffe that he won’t bring the glory years back to Old Trafford by copying Manchester City ’s blueprint for success. Ratcliffe admitted that he viewed United’s biggest rivals as the ultimate football powerhouse after sealing a £1.3billion deal to buy a 27.7 percent stake in the club he supported as a boy. Britain’s richest man has already raided the Etihad to take City executive Omar Berrada to United as the club’s new CEO – and wants former Blues’ academy chief Jason Wilcox to join him in a recruitment role. But T…