I opted for 80/90% as I feel that Mr camera car contributed to the accident by being too close and not taking the care required at a junction, but the Audi has made the biggest error so he gets most of the blame.
That is also what I would expect my insurance company to say.
I found it amusing to note the speed with which the Audi reversed out of the way, not going to make any difference pal, nobody's going to believe you never left the side road
2.5 Million miles of non-advanced but hopefully safe driving, not ready to quit yet