Very interesting book:
https://amp.theguardian.com/books/2015/jun/08/boarding-school-syndrome-joy-schaverien-review

“Attachment – the crucial establishment of trust and security through a primary carer – is the basis of modern child development psychology. Boarding schools could not have broken or redirected healthy attachment more effectively, as Schaverien illustrates. From the moment the parent drove away, a child had to adjust to the fact that not only was privacy and safety no longer guaranteed – let alone the consolation of a hug – but that their parents had chosen this future. John Bowlby, the psychologist famous for first coming up with attachment theory in the 1960s, described public school as part of “the time-honoured barbarism required to produce English gentlemen”