I cycled in London (as a child) before I drove there, but looking back it was all about good luck and not about judgement.
Later I drove, cycled and rode a motorcycle in The Smoke. Each mode of transport gave me tips and hints about the others.
It may be worth having a little drive around London in a car (or being a passenger in one) to see how cyclists look from behind glass and pillars.
This is not as silly a point as it may sound. If you know how you appear to motorists and which other visual signals you are competing with for their attention, you may be better able to put yourself in the clever place and minimise the chances of an unpleasantness.
Having said that, I've had relatively few unplanned dismounts in London over the decades. More were my fault than not - and the speeds are lower than in The Sticks, so anything striking you may do so at a lower closing speed.
Lorries, buses and high-sided vehicles would be something I'd look out for just a little bit motre than I would other traffic.
I do creep up the nearside of the odd bus or lorry, but in doing so I accept that I may be altering my appointment with my maker.
Generally speaking, avoid the nearside of lorries, buses, even panel vans.... Be aware that many HGVs are LHD or have LHD tractor units.
Avoid braking on painted lines and have a huge amount of fun!