May I say it's good to have you here to answer our questions prof Rizzah, you're clearly the most intelligent and informed among us in the economics field.
In my experience the bald guy is always the smartest in the room, until Richie Agar comes in and ruins that theory.
Congestion charges are usually trying to change behaviour - it's in the name. Like prevent cars from coming into the inner city. Only works if there are sufficient alternatives to using the car, like on-time, frequent public transport/rail, suitable bike infrastructure (protection from cars) etc