As someone who commutes to London a couple of times a month for work ( on the train ) I see some of the traffic first hand, its a nightmare and maybe the only thing that stops more accidents is the fact that there is so much traffic on the road its often at a standstill, but I wouldnt fancy being on a bike personally as people rush around, even when some miss the tube it seems like the end of the world, yet the next tube is only 3/4 minutes away.
As for the " traffic violation vigilante " I am surprised that he either hasnt had his face punched by now or been warned off by the Police, plus if he is that noticeable he could cause an accident.
Maybe Police on bikes around London is the answer if they dont have a few already
Plenty of Old Bill on cycles in London. On one hand this fellow is bringing bad/dangerous driving to the attention of the authorities, on the other he is probably attracting bad driving behaviour because of his dress and demeanour. Probably overall a good thing if it causes changes in road layouts and rules to favour cyclists IMHO
Having watched some of his videos I think he is a bit of a tit. Some situations are made so much worse because of his behaviour. On a couple of videos he repeatedly chases drivers to mouth off at them.