I don't buy this bollocks that some people are spouting that RLJing on a bike is 'mostly harmless' and prosecution by the Police is petty and they should be concentrating on bigger crimes. RLJing is dangerous, and pedestrians can get hurt or killed by those who do it. Sure, you're more likely to get killed by an RLJing lorry than an RLJing bike, but that's scant comfort to those pedestrians who get hit by cyclists and have to look out for some self-centred twat on a bike despite the fact they're crossing on a green man.
The thing is this: jumping a red light, regardless of what kind of vehicle you're riding/driving can be safe in some circumstances. If you feel that you can safely cross a red on a bike, why shouldn't someone on a motorbike or a car or a lorry, as long as they are careful? The answer is that people can't be trusted to make that decision accurately, even if they think they can.
Lights are there for a reason. They ensure that those who should have priority on the road at that time have it regardless of the ability of the others, as long as the road signals are obeyed.
We can't have some two-tier system where those with the leet skills to cross reds safely have different rules from those who can't. The law must be applied evenly.