When myself and Mrs P were on holiday in September, a bus clipped her car outside of our house. The driver left the details so no problem. When we got home the damage was so minimal that it was not worth claiming. Several weeks later MrsP got a phone call from Direct Line, our insurer about the claim. She told the insurance that she didn't want to claim as there was only one small scratch on the bumper. This is still going down as a no fault claim, even though she hasn't claimed. Because the bus companies insurer has logged the incident it shows up on the database, and they seem to expect you to claim, even when you don't want to.
Slightly different with them. Bus drivers have to log stuff otherwise it can go wildly out of control with complaints - you'll lose your job if you're not careful (I know people on a cycling forum don't believe that but it is the case).