rail writes:

There are still circumstances where you can be instructed by a police officer
in uniform to pass a red light. eg when the lights have failed and the
crossing is being controlled manually.

Not only can you be instructed to pass the red light, but where a
junction is controlled by a policeman on point duty, the junction should
be treated as though the traffic lights are not there. I wonder if
anyone has received a red-light camera penalty when the junction is
being controlled by a police officer?