FA chief executive Mark Bullingham has revealed a ‘succession plan’ has already been drawn up should Gareth Southgate leave as England manager at the end of Euro 2024. Southgate is taking charge of his fourth major tournament as England manager, starting this weekend against Serbia. Only Walter Winterbottom and Sir Alf Ramsey have managed more England games than Southgate, who will pass the 100 landmark should the Three Lions reach the quarter-finals. That is seen as the bare minimum for an England side many have tipped to go all the way this summer. Southgate’s side finished runners-up to Ita…