According to this article in yesterday's Guardian, the hierarchy of road users that traffic engineers should be: disabled and visually impaired people first, pedestrians next, then cyclists, public transport, delivery vehicles, cars used for business with more than one occupant and, at the bottom of the heap, single-occupancy motorists.
Evidently the traffic engineers behind the signals from Constitution Hill (incidentally, this country doesn't have a Constitution, but we have a road commemorating one) to Hyde Park Corner. Cyclists and pedestrians get four seconds of green out of a three and a half minute traffic light cycle!