Returning (reluctantly) to the original topic...
It strikes me, watching that video, as someone who rarely cycles in a city and extremely rarely in rush-hour London, that almost everyone moving in it is behaving irresponsibly.
When you approach a junction, with or without traffic lights, it makes sense to ease off and slow down: if they're red, you'll need to stop. If they're not red, they might turn red at any moment, and anyway, people will be turning at the junction, maybe conflicting with your path through it. Someone might even jump the red light!
No-one seems to be easing off on their approach except the scooter rider. In fact all the bikes, far from easing off, are busy overtaking one another as they approach the junction.
Then, when the lights change (who'da thunk they might change?!) at least two of those riders are caught out when another road user actually anticipates this and stops!
Now, I realise the rules are completely different down there, but maybe you guys need to relax and chll a bit...
What do you win if you get to work first anyway? Must be something pretty damn good to be worth taking all those risks for.