Well in my opinion, the guy saying he was reading the signage on your trailer rather than reading the road and backing off kind of says it all. I’d take that as an admission of fault as he told you he was reading signage instead of concentrating on driving as well as saying he wanted to get past you and tried to undertake and an incident occurred from it. . . That would be my take on it anyway but I could be wrong as I wasn’t there and don’t know the roundabout etc.