My daughter's school (in the UK, its a 6th Form College, and they are coaches rather than public transport type buses) pays third party to run transport to sch

My daughter's school (in the UK, its a 6th Form College, and they are coaches rather than public transport type buses) pays third party to run transport to school. I assume they are free to use those vehicles elsewhere during the day and on non-school days. That said, only those coming from further away use these - my daughter and others reasonably near use public buses.