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I don’t know if it’s different in the UK, but in the US, no child is ever left alone. There’s always at least one staff member there, and they don’t leave until the last kid is picked up, no matter how long it takes.
Things must have changed since I was a kid in the US. I remember being told to start walking when my ride home fell through. They wouldn’t let me use a phone to call for another ride (pre cell phone). The teacher did ask if I knew how to get home and I did, but the only route I knew was along the high way.
That happened a few times.