Another, but slightly different example, might involve GCSE Geography students who are required to collect extra fieldwork data over the summer holidays?
Schools are considered largely responsible for students in their care during normal school hours (unless a parent/guardian has informed the school to the contrary – for example, if a student is off sick at home). During normal school hours, students that wish to organise independent visits away from the school site should only do so with the permission of those teachers who have been assigned responsibility for them (e.g. the Headteacher or Head of Year, depending upon school policy). The school’s response is likely to depend partly upon its own general policy with regard to allowing senior students to go offsite during school hours e.g. at lunchtime. It is normal practice in many schools for students who wish to leave the school premises during normal classroom hours to first gain permission and then to “sign” themselves out and back in.