Not RTFT.
I would say that you have safeguarding concerns and that this is outside of the school’s expertise.
Ask for a meeting with the child’s parents and the child’s multidisciplinary team, including the gender specialist who ‘prescribed’ a ‘stealth’ (ie secret) social transition.
Say you can’t adequately risk assess the situation for either the child, their sibling or their classmates without that expert involvement.
Absolutely no one sane nor medically qualified to work with children is going to seriously suggest secret social transition for 8 year olds in the U.K. in 2023, so I would doubt the parents are able to rustle up the MDT supervision that Cass recommend.
Best they will be able to come up with is Susie Green and a letter from an unnamed euro dermatologist working in Webberly’s outfit, which is obvs going to be very easy to discredit.
The school are potentially making themselves legally liable for carrying out a powerful psychosocial intervention without proper medical or psychological input.
This kid could’ve just had short hair, trousers and a boy’s nickname and the class could’ve been told that the new classmate is a girl who likes boy things and still had all of the protections of being supported by staff to be a GNC child without any of the secrets and safeguarding risk.
if said child went on to transition as an adult everyone from childhood a) all their old school photos would still show them ‘looking like a boy’ and the world around them would likely find news of the transition unremarkable.
I knew an extremely GNC female child in the early 80s who was an early FtM transitioner (Buck Angel’s era) and when our village grapevine heard the gossip that little Alison had grown up to be ‘Al’ everyone just shrugged and said ‘Makes sense, I suppose!’
(although looking back I wish there was more acceptance for naturally butch women and worry about the long term medical burden of transition)