By Nathan Ridley Manchester United have made their first public admission that under the Glazers, footballing success has not been their first priority. The American family have owned United for nearly two decades, during which the 20-time English champions have suffered a stark decline on the pitch while undoubtedly being successful commercially. Now with boyhood United fan and British petrochemicals mogul Sir Jim Ratcliffe set to become a 25 per cent stake holder, it’s emerging that the Glazers finally recognise their shortcomings. Through his conglomerate, INEOS, Ratcliffe has pledged to he…