Perhaps the law is different in Scotland than England regarding school trips.
We have to sign forms each and every time the children go on a trip away from school. Also they are not allowed on transport that doesn't have seat belts. The LEA have special school buses that they use for this purpose.
I have today just filled in a form for ds to go the local fire station which is 2 minutes walk away from the school.
It is a Catagory A Visits form and states "I fully understand and accept that, whilte the supervisory adults in charge of the group will take all reasonable care of the young people, neither they, nor Norfolk County Council, can necessarily be held liable in respect of loss or damage to property or injury suffered by my child arising out of the educational visit/journey, unless such loss, damage or injury results from the negligence of NCC, its employees or official volunteers.
Hopefully you will get the headmaster's side tomorrow and gauge it from there. I am glad your dd is ok.