I brought this subject up last year and was told by a forum member, what do you expect living in a rural area!!
back In the 1920-30s my father and his family lived in Avon Lane near Tytherton and worked for the local farmer. one night there was a knock on the door and the village bobby reported 'mud on the road' which came from a local field. Grandfather said to his boys, they had to clean it up or they would be out of the tied house.

the problem with rural areas is who is to blame ?, there is probably 3 or 4 farmers who run up and down the road, or even one of their workers. could also be a local horse owner who has run their horsebox/4x4 out of the fields.
when we were organising mx events we were responsible for road cleaning, the problem is when is the road clear?

sorry to hear of your accident but , you might have to take the insurance hit yourself. if you reported it to the police could they provide you with a crime number? did you take photos or get written statements?