Leavers
If children had a very good reason to leave then they could leave the show and the parents would have to come and get them, all their belongs would also be returned to them. A good example of this was a girl from series one who didn't want to harm animals and eat them, not because she was a vegetarian but because she loved animals. Because of this she kept persisting wanting to go even with everyone else begging her not to, she cried and in the end she made her final decision to go. The last scene of her is when she is saying goodbye to the staff and the final shot shows her leaving and walking towards the train station for her to return to civilisation. It is not known of which of the children left but can confirm that it was a girl who left.
Read more about this topic: Evacuation (TV Series)