Overtaking Cars - Legal Status

It is certainly less dangerous passing stationary traffic on the right, for three reasons

1. Drivers can see you in their rear view mirror/ oncoming drivers can see you clearly.
   
2. The likelihood of doors opening on this side is much less.
   
3. There is more room for drivers to yield to you, and you arent stuck in the gutter.
   
   
   
   

This^

More and more of our urban riding is going to involve this sort of riding,
with care filtering past queue nodders is no riskier than other riding in traffic situations.
as an aside, it seems to me that more and more drivers are yielding to me filtering past, moving in slightly to allow room, it just makes sense.
what do others find?

This ^ again. I was passing on the right as I've found it a better place to be.

I second what you say about finding that more and more people will move over slightly to make room, but often I slow to a stop, pulling in to the queue of traffic. Whilst I appreciate the on coming car yielding to me, I don't always trust their judgement with how much room to give/speed to approach, and I don't want to anatagonise leave them thinking "stupid cyclist get out of my way". Whilst this view is obviously wrong, behaving in a considerate manner towards them will help to build positive relations with other road users (everyone seems to loathe the cyclist) and will hopefully mean that they behave in a courteous manner back.

This is pretty much it isn't it, you've got to look for that break in the traffic and the junction. This has to be one of the most common error situations?
It got me when I was on a motorbike once. Learn from mistakes, which I guess you will now. Lucky you're ok.

At the time I felt I was being quite careful, only moving out when there was no on coming traffic and trying to scan ahead. Evidently I wasn't and as you say, luckily I was ok. I'll definitely watch out for it more in the future, and filter up through traffic more slowly.