Firstly I don't agree that there are lots of 'whingy threads' on ED Forum. There are lots of things in the world going wrong and it's positive to discuss it.
Coming back to Road User Standards, there's plenty to complain about - especially lack of enforcement regarding frequent speeding, illegal use of car horns, ridiculously loud music from vehicles, etc etc.
One thing that happened to me this week - I was driving in East Dulwich on Monday. A person on a mountain bike sped past on the inside and bashed my wing mirror hard. He looked back but speeded up instead of stopping. I followed him, but he clearly didn't want to discuss what happened, so I couldn't follow without engaging in dangerous driving myself.
Was it deliberate or an accident? Has this happened to anyone else lately? Hopefully not a new sport in the area.