Oh, and another thing, in Britain the cyclists all think they are on the Tour de France and have drop handlebars so they are streamlined into the wind and wear lycra.
It's not really fair to compare the cycling environment in The UK to The Netherlands or Denmark. People that are out on the roads for pleasure, or have a long commute, need to carry enough speed to mix with motorised traffic at some point. Racing bikes and technical clothing is how people do that. That's not the case in those other places.
It's not speed that dangerous, it's the differential in speed that makes things dangerous. That's what makes The Netherlands safe for cycling. You're mixing with people going roughly the same speed as you almost 100% of the time.
btw, I've talked about Westminster Bridge a lot. That's THE WORST place in London for pedestrians spilling out into the cycle lane. There's not nearly enough division and it gets jam packed on the pavement [sidewalk].
Renting Lime bikes is something I'd advise against for North Americans visiting London. Looking the wrong way on a bike out in traffic has the potential to end up even worse than being a pedestrian.