I have on occasion waited at traffic light controlled intersections with a police box and officers on duty. They stand there watching vehicles ignore the red lights and proceed through the pedestrians trying to cross the road.
Last week, I watched a woman step out to cross, there was a clearly visible red light for all traffic. A car drove right up to her and she stopped, pointed at the red light and stood her ground. It was only when the driver nudged her that the police did anything. They spoke to him briefly then went back to whatever they were doing.