Expiation: worth fighting?

[abrogard]

I wait for the red turn arrow to go out. The say I've broke the law.

Anyone know the exactitude of it?

They say

"We advise that the red light camera will only take a photograph of a vehicle if it crosses the stop line and is entering the pedestrian crossing or intersection whilst the traffic light is red. A second photograph is taken following a short delay to establish that the vehicle continued to enter the pedestrian crossing or intersection. "

but in fact the traffic light not red. You can see it is green. The turn arrow is red. I am in the habit of pulling up there and waiting, the quicker to get around.
They have no photo of my going around while it is red, only of me waiting.
That's me in the grey mitsubishi waiting. Two prior pics show me in the same place.
1. What exactly is the law?
2. If I have a show what's the cost/risk of going to court and arguing it?

Very well might be the wrong venue for such queries in which case, sorry, please direct me to a better if you know of one.