srw
It's a bit more complicated than that...
In this case there will be a whole lot more bodies littering the trunk road network! I don't know the road in this case but it does appear to be one of the main A roads for the area and is probably closer to being a motorway than a road.
It is. At that time on a Thursday evening it would have been rammed full of traffic doing 70mph. The prudent thing to do if you think you've hit something is to pull over as soon as it's safe to do so, and phone the police. The next layby is just south of the M25, about 3 or 4 miles further on. There is no hard shoulder to speak of.