if you count like that, your previous point doesn't stand. In a three lane (1 direction) system you have two passing lanes. Easy. You still return as much to the right (or outside) as possible and sensible under the way you're driving. For example return to middle of you're still cruising faster than the lorries in the rightmost (or outermost) lane.
they is the uniform vehicular code. they do count like that where you are, you just don't pay attention