She never rang! Sorry guys.
Ahh, the power of the singletrack forum – clearly she is a reader.
One thing to consider, you might want to report the incident to the local police station, just to cover your ass.
Not sure I'd want to do that though, as it might make it difficult to tell my insurer that I'd not been involved in any accidents.
Road traffic incident has nothing to do with the school, the head won't want to hear about a minor scrape.
Might not want to hear about it, but if it was the head at our school and I was the OP then they probably would hear about it, especially if I thought it was symptomatic of a wider problem that was a danger to my kids. OTOH you can't have too much information. I think the head may well "want to know" just because they like to know everything that is going on in and around the school.