It is the only known school for all the special teenagers and children in the UK, no matter what species they are. The school accepts all pupils under the age of 18, even as infants, if they have already manifested or are born as non-human. There are a few exceptions to the maximum age limit, e.g. if a particular student legally couldn't enroll until he or she was of age. The school would also ban any whose nature would make them a threat, in order to protect the others there. The students can leave when they see fit, as long as they have already gained control of their powers.