The Sout Pier Roof Spectator Viewing area was. from memory open much longer than the North Finger and at one time the S.Pier even had a snack/coffee bar (offshoot of Eddies?). The Centre Pier had the Control Box halfway down (BAA Apron - who moved out leaving the unit empty and BUA Service Control, then BCAL Service Control, until it too moved, this time to the Eighth Floor and change of Name to GOCC (The lift strike that occurred sometime after the move meant we were all very fit).
Anyway here is a rare view of the Terminal Building from the North Pier Spectators Terrace (Caz Caswell with permission):
Opssys