At least use some latin that you know what it means and can apply it correctly.
Look at Gwladys St at kick out time. Much fewer people than will exit at BMD, but, and this is crucial, those people are going in both directions, people cross each others paths, slow each other down to a stop on some occasions.
Once out of the gate at BMD (you can even choose a gate closer to your chosen destination to reduce the 'collisions' with others) there will be no contraflows. Once out onto Regent road, that road can be saturated or even supersaturated with pedestrians and they keep flowing because they are all going in the same direction. Then once some have walked faster than others, that dissipates the saturation/supersaturation. GS can never get close to saturation. (Comparing the egress flows once you are beyond the pinch points (ie when the flow gets to the side roads at GP) is a nonsense.)
Let me explain this further, imagine a pipe of 100cm diameter, you can push fluid or sand through there (people are just big particles) at quite a rate. Now imagine a pipe half of that diameter, 50cm, and try pushing fluid or sand both ways down this narrow pipe. Which one allows a flow and which one doesnt?
Quod erat demonstrandum