By Mark Kleinman Mark Kleinman is Sky News’ City Editor and is the man who gets the City talking in his weekly City AM column. This week he tackles the Post Office boss, The Observer sale and Afiniti. Post Office needs a boss who can read the roomNot a moment too soon. To read the Post Office’s account of its departing chief executive’s tenure, it has been an unmitigated triumph. Nick Read, we are told, succeeded in leading a settlement with hundreds of Group Litigation claimants, “beginning the journey to address the wrongs of the past and to reset the relationship with Postmasters that conti…