I was driving into London on a section of road with three lanes when the traffic bunched up just before a set of lights. There was a slow moving London Bus on my left, completely hiding the traffic light, and on the right-hand lane, a large stationary van turning right which covered the other traffic light. There was no second set of lights on the other side of the junction. I stayed in my lane and crossed the junction and was aware of a series of flashes in my rear view mirror. I believe I may have triggered the red light camera on that junction. It was only two days ago and so I do not yet know. Would I have any defence against the charge if I could demonstrate I was completely unable to see the lights and stopping suddenly with traffic moving either side and behind me would have been dangerous?