The School with no Teachers

All young school children know full well what to expect when they arrive at school each day. Imagine arriving at school to find out that something very important was missing that day. Maybe there were no teachers, no school bell, no rules or even could it be that there is no custard in the canteen. Follow the adventures of Oscar and his friends as they go to school only to find that something is missing. Something is not just quite right. What could possibly be the reason?