A really interesting thread, if a little old
I cycled in to the scene of a dooring a couple of months back. A laywer turned up and told the driver and passanger that it was not their fault (You can see his argument / logic here:
View: http://www.youtube.com/watch?v=dlfTY0rV1nQ
)
I was quite sure this was incorrect and so did some research. From what I found out - the offence is opening a door so as to pose danger to others. There could be any numbers of issues / 'mitigations' / blame or others offences occuring at that time which you could try to argue through, but if a door is opened so as to endanger another individual the offence has been committed. Most interesting is when I read: "
The Crown do not have to prove carelessness, nor that someone was struck or injured, only that the act caused danger."
Of course regardless of this, I always try to ride outside of the door zone!