When they revamped London Bridge station some years back they took down the excellent big board full of departure information and replaced it with giant advertsiing displays. The departure informaiton was then displayed on little screens at awkward angles. The effect was absolutely appauling. I was a commuter at the time and had to scurry into the station and then weave my way through the seething mob to see one of these screens.
I was up there on Saturday night and they have renovated yet again. It seems that this time practicality has trumped advertsiing. They have cleared the whole area in front of the trains from platform 8 up and installed a massive bank of turnstyles. They have also installed the monitors displaying departure information back above the turnstyles.