Sometimes drivers (Hampshire anecdote so maybe not applicable to central London) are "over-deferential" , waiting in an overtaking lay-by (the sort you see cut into the hedgerow every few hundred yards on single-track) when there is ample room to pass safely.
I think the ratio of cars being nice to me and me being nice to cars, by pulling over and waving them past, is about 1:1.
Generally I find cyclists and motorists get on perfectly well.
My main concern in all these (Motorist v Cyclist) issues in London will force a reaction impacting the whole country. I know they are not 100% London-based but it does feel that way when you watch the "Cycle War" style documentaries or read articles in papers.
I can well imagine London based petrol-head MPs, whose commute involves a taxi ride from Kensington to Parliament, thinking that something drastic needs to be done, although, mostly, nothing does.
Even in London itself I imagine that, mostly, nothing needs to be done (I have previously posted that all my issues in London have been with knob-heads on bicycles, not cars).
If you add up all the interactions we have with cars, and then add up all the terrible interactions, it's probably not a bad ratio.
Let's hope that MPs are distracted by the flood of (two at the last count) Romanians and forget to force through some sweeping legislation that impacts my fairly "live and let live" cycling in Hants.