The ignorant drivers are rarely the problem, they are easy to re-educate. As for the rest, either you don't have much riding experience with London and UK traffic, or you've been cycling with blinkers on.
Sure, I haven't cycled much in London, but it isn't the only place, not even the only city, in the world, you know. Otherwise, about twenty years commuting, club-riding, touring, taking part in sportives etc. in cities and countryside around the world, most in Britain (living mostly in Oxford and Newcastle), but also in even bigger and more crowded cities than London - Tokyo for example. Seeing as I have had very few accidents on the bike, I would suggest that I ride very much with my eyes open.
There's no point to you being quite so objectionable.
As for the assumptions, I think they are perhaps mostly on your part.
This is an argument of the 'I'm not but you are' variety...
I posted elsewhere that it's a very tiny minority of drivers that are a problem. I have 84 youtube-worthy incidents in almost two years and 360-odd commutes. That's around one dodgy driver in 4 commutes. I think each of my commutes has, at a complete guess, an average of perhaps 2000 driver interactions, I cover a lot of mileage in sometimes very dense traffic. One dodgy driver in 8,000 is amazingly small, even to me. I think cycling is very safe, as safe as many other day-to-day activities we take part in.
Well, yes. So where are all these people trying to bully you off the road who you claimed were the problem? Are even all the 'dodgy drivers', bullies?
In any case, you agree that there are a vanishingly small number of people trying to bully you off the road out there, even in London. However you were the one who claimed that being bullied off the road was the problem in this case we are discussing. It isn't. It's a different problem. We're talking about visibility, and in that context, any reference to bullying is a diversion. It's a form of 'whataboutery'.
Visibility, however one achieves it - and I have an open mind on this, in fact yesterday I went out and bought a new back light as a result of the discussion above (thanks, Gaz) - is really presaged on the basic assumption (and it's not an assumption unique to me or which I invented) that someone is going to have the best chance of seeing you AND take some positive action on that basis - give you more space, or at least not put you in danger etc. The aggressive driver is not going to care whether you're more visible or not. Visibility will not do anything to help in the case of someone with an intent to harm you, and there's no point in discussing it in relation to that possibility.