Ok, I'll get involved, it's gone a bit far this!
Zig sags are purely there for the safety of pedestrians using the crossing, hence why they're on both sides of the crossing, and road. Agreed?
Basically, don't park within them, and don't overtake the vehicle that's closest to them in your lane. Opposite side of the carriageway has the same rules.
Golden rule is, if you can't see the whole crossing including the pavement where pedestrians stand, then you shouldn't be overtaking.
Consider the elderly taking more time to cross, children being smaller and not as easily seen, and cyclists (at toucan crossings) appearing quickly from out of nowhere as they generally do!
It's a 3 pointer, and a fine which I believe is now £80 (not done anyone for a while). Or the death penalty for the pedestrian you hit!
Now stop arguing ya bloody drama queens and go have a beer!