@SRD, I'd blame myself for riding in the door zone.
Undertaking is probably an unfortunately pejorative term, however as described many people do not anticipate vehicles passing on their left so we ought to be exercising extra caution when passing vehicles on our right, especially if it is a solitary vehicle and doubly so where there are other hazards (as with the junction described above).
It's one of the reasons why I will always pass on the right if it is at all possible, even though it may be legal to go up the left.
Agreed, the bike/car/whatever crossing a carriageway has ultimate responsibility to ensure it is safe to complete the maneouvre, however as someone pointed out above, that's little consolation in an ambulance and regardless of the outcome it's surely commonsense and good manners to do everything in our power to avoid forseeable collisions. Even the most careful people WILL make mistakes.
As many will know, I don't hang around in traffic, but passing a vehicle on the left at a junction is a very clear danger point and anyone who has had good training should be pretty much expecting a crossing vehicle. Add that to watching the front wheels/bonnet for the first movement, moderating your speed and position to allow for the risk, making eye contact with the driver etc etc, fundamentally, regardless of legal liability, it's a 90% avoidable collision.
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