@izzythepush,
do you have "Waze" in the UK or something like it? I would imagine you would - there would be no reason not to have something like that.
It is an app on your phone that you use as a GPS - but it is over and above a normal GPS - when there is traffic ahead or an accident - it will give you an alternate route to avoid the traffic. It will also warn you on things like those traffic camera lights similar to what you are referring to - some places have these cameras that will snap a picture to get you trying to get through a yellow light when it turns red - you know those people who try to push the limit.
Anyway Waze will warn you ahead if there is a speed trap, traffic camera, or police so far ahead. It certainly helps in areas you are not familiar with. It also warns of traffic hazards like something in the road.