I can understand where children who are at risk (ie those living in potentially abusive households, are involved with drugs / criminal activity, are at risk of sexual exploitation) might need to be flagged by schools - with information confidentially held by a safeguarding officer and divulged on a ‘need to know’ basis to key teachers etc. However, these are situations which the parents are already likely aware of (if not directly, they’re potentially part of the ‘problem’)? A pupil telling a teacher in confidence that they think they are struggling with their gender identity / think they might be trans / are trans is hardly the same thing. There is no risk to the child in divulging that, and it would be a serious breach of trust and potentially dangerous to pass that information on to their parents.
In the same way that I wouldn’t expect a teacher to tell parents if their child had come out as gay to them (in confidence), I wouldn’t expect a teacher to break a confidence and tell the parents they said they were trans. Obviously if the child has come to the teacher to ask for support in telling their parents, that is a different matter.
It’s similar principles that therapists adhere to with minors. They make it very clear at the beginning of any counselling that everything discussed between the therapist and the child is confidential and that the ONLY time that confidence would be broken is if the child indicated they would hurt themselves or others.
Let’s imagine that a teacher DID break a confidence and tell a child’s parents that they had been told by the child that they were trans? While I’m sure everyone here would react calmly and in a measured way, not all parents would. Imagine if that news meant the child was physically beaten by the parent? Subject to psychological abuse? Subjected to some religious ‘cure’ therapy? Kicked out of the house?... How is the school to know which parents might react like that, and which wouldn’t? In a large secondary school where parents often don’t meet the teachers (especially in households which might already be less engaged with their child’s wellbeing), it’s a huge risk.
Because teachers can not predict how parents will respond and because questioning your sexuality or gender identity is not a danger to life (or significant physical welfare) of the child or others, it is considered a safeguarding risk to TELL parents and is not considered a safeguarding issue in itself.
These are the guidelines that are currently adhered to within schools. Hopefully my explanation above helps explain why that is the case.