They should be taking him to court. I don't know why they aren't... You should be able to get a free iniial consult for legal advice lots of places offer that

It should be evident from the damage who hit whom, if he was on your left and he hit you then it seems fairly obvious that you were on the roundabout already. It's give way to the right not first in best dressed.

If he was already on the roundabout you would have hit him

He won't hve told his boss cos it's probably a work vehicle, can you call the company and say you want to speak to someoe about the accident you were in with their driver when he hit you?