Trying to look at this incident and it's related problems dispassionately:-
I can see the argument for not undertaking/nearside passing,by car drivers as overtaking is supposed to be on the offside so when that rule is abandoned by cyclists things become confused.
From the cyclists POV cycle lanes are on the nearside between curb and other traffic and as any cyclist knows cycle lanes can stop abruptly leave a cyclist on the inside of stationary or very slow moving traffic,worse than that the cycle lane can then start again just as abruptly within a few hundred metres or less.
So what is thee cyclist supposed to do?
Sit in traffic going nowhere?
Swap sides and overtake the standing/slow moving traffic on the offside,where there's no cycle lane and back to the nearside when it's reinstated?
Neither of these situations is ideal or even good,and very much worse for the cyclist who will always come off worst in situations such as these.
That said given the known situation of traffic flows and cyclists habits in London and other big UK cities,a person exiting a car on the nearside when the car is stationary in traffic and not parked up to the kerbside should have the wit to look before opening the door,likewise the driver should have checked the nearside mirror and indicated to the passenger if it wasn't safe to exit the car.
It's not rocket science to imagine the situation in the car,the passenger seeing the traffic is at a standstill decides he's be quicker on foot saying to the driver "I'll get out here it'll be quicker" the driver then replying,whilst looking in his nearside RVM "OK sir,just be careful getting out there are cyclists coming up the nearside wait until it's clear".
Or the passenger just thought,'I be quick walking' and simply opening the door without looking,onto the cyclist as he's passing.
Overtaking slow moving or stationary traffic on a bike is a hazardous manoeuvre which needs caution and forward thinking,overtaking on the inside is even more hazardous,and IMHO those who do it regularly should be all the more vigilant especially in cities and where taxis are abundant and traffic is stationary.
I won't overtake on the inside as my urgency weighed against possible injury or worse isn't worth it.
All that said in the situation being discussed IMHO the car passenger is at fault and the driver is responsible for his passengers,especially a professional driver who drives in the the city regularly.
It's situations like this that beg the questions why isn't there better cycling infrastructure?
Why aren't people,both cyclists and drivers/passengers,more careful in situations such as these?
I listened to this subject being discussed on Radio2 yesterday lunch time,what very quickly became apparent to me was the prejudice quite a few callers and the motoring journalist defending Chris Grayling's actions have about cyclists,with the usual diatribe of no VED,insurance,numberplates,no accountability for their actions,RLJing,shouldn't be on the road,etc,etc.
I find it quite sad as one of the callers did,that there's so much anti cycling sentiment,as she explained people should see the positives of cycling within cities as a bike is one less car,so in turn cause less congestion on the roads and zero pollution,it's more healthy so saves on NHS costs in the long run both for cyclists and non cyclists alike,and in the short term the benefits of stress relief of cycling over driving,is apparent to anyone who cycles.
I find the prejudice against cycling both surprising and intolerable.
Whilst I'm on a rant I may as well say I also find the paltry amount of government finance for cycling and ease by which even those monies are siphoned off into other projects up and down the country other than cycling very depressing,whilst motoring infrastructure runs into the billions of £'s
EDITED for typos and clarity.