By Mark Kleinman Mark Kleinman is Sky News’ City Editor and writes a weekly column for City A.M. And you thought the official overseeing the much-derided VAR had the toughest job in the Premier League. Spare your thoughts, instead, for the legal team supervising English football’s top flight. After Financial Fair Play charges laid at the doors of Manchester City, Everton (twice) and Nottingham Forest, the current Premier League champions are doubling down. As I revealed on Sky News last week, a club (understood to be Manchester City) wants to pursue an arbitration process to overturn rules gov…