Agree re using the guidance. Challenge directly using that.
Longer version: Given the number of young, inexperienced teachers who are in charge of RSE and baring in mind now that LEAs are not the central point of contact for curriculums anymore and subject leaders look around for resources they can buy in, I would absolutely read the newest RSE guidance around all this and use it, challenge the school over it.
I need to highlight the fact that ofsted now have an enhanced scrutiny of subject leaders in primary schools to make sure foundation subjects are not being forgotten.
Young teachers are given a subject to lead in with little support. They go off and join Facebook groups who are often the led by and contributed to by people who run various charities with varying opinions over the whole issue of trans. (You also have the issue that some teachers truly believe in the full ideology).
They buy into schemes and dole them out and staff follow them verbatim.
Heads should be looking at it all in detail; mine hasn't a clue what I've personally written for my own subject.
Heads and many assume all this is ticketey boo safeguarding wise. But there is no safeguarding rule around the issues associated with gender identity in schools; the only guidance we currently have is what the government recently issued.
So absolutely challenge anything and contact Safe Schools Alliance U.K., transgender trend and share it here for advice.
The PSHE association is completely captured. The Key which offers training for governors is completely captured. Don't rely on an ofsted inspector to have a clue either. (I work with one.)