Buses and red lights especially in London

[supermono]

First of all let's ignore cycles in this thread...

It seems bus drivers have a two second rule when it comes to red lights, as a motorcyclist, cyclist and pedestrian in London I can't rely on a red light stopping a bus, black cabs too to a lesser extent.

These things are riddled with cameras as far as I can tell, yet it happens so much they must be overlooked somehow -- I'm certain if I ran red lights as often I wouldn't last long with a clean licence (or my life!)

So what's they story? Anyone know how they get away with it??