This was taking kids to my old school (Calday, the boys grammar). The girl who died would have been going to West Kirby, which is the girls grammar. Back when I was there these were catchment schools for the western side of Wirral Borough, but these days they attract kids from all over (provided they pass the 11+ entrance exam), which will be why there was a shared school bus coming up the motorway from that far out.
The injuries and trauma suffered here is going to weigh heavily on these schools for quite some time.