Ever since automatic ticket barriers were installed at New Street last year, a knowledge of station geography has become a necessity. Something which a stranger is at a disadvantage with. Exit from the A end must be treated carefully, if intending to change from platforms 1-5 to 6-12 as once at the upper level any body wishing to pass between these two zones have to pass through two ticket barriers, whereas a walk to the B zone will find a dispersal bridge that links up all platforms.
That is of course the "open" platforms. Platform 9 is presently not accessible for the on -going refurbishment work. Once 10 and 11 are done, I presume the work on the station will be finished.
As to the east bay, Platform 12, will this be reopened. If lengthened it could hold a 323 or 350 unit, but then sensible station improvement is probably not on Network Rails agenda.