Comment by andrewaylett

In the UK, if you're at all over the line when the lights change, you're considered "in the junction" and are expected to leave the junction -- the next phase should give you priority to do so. The only way to run a red light is to start crossing the line while the light is red -- although plenty of drivers will start to inch across while they're supposed to be waiting :P.

The most annoying scenario is where a driver has either stopped or inched forwards far enough that they can't actually see the lights any more and don't know when they've changed.