Imo, he checked his mirrors but not wing mirrors.
I always do this and even the blind spot as I have had a couple of near misses due to that and have learnt my lesson.
It would really help me if he had. But he knew he caused it. Personally, I would have stopped to make sure I was ok as I could have died getting hit by a truck.
Furthermore, if the truck didn't hit me, it would have hit him actually.
And Cuppa, yes I live in Great Sutton and use it everyday, have done for the past 2.5 years LOL. Used ot have a Williams if you ever saw one of them. I have no idea what new car I am getting.