[ChrisCurvyS]

Sorry RH I was being a bit sparing on the details for the sake of discretion - I've got a work connection to the case.
However, I did get across the essence of what was initially explained to me - the driver had done nothing overtly "wrong" as far as she was concerned and pedestrian was at fault.
But as I suspected, turns out there's more to it - the pedestrian was in the road for a significant length of time before being hit, driver made no attempt to brake and witness said she appeared to be looking at something in her car. So that explains the driving meeting the "falling far below" criteria which I'm aware of.
Thanks for the responses and sorry again for the evasiveness.