As pupils settle into a new academic year, BBC News has spoken to two parents whose children have questioned their gender about the impact the lack of transgender guidance for schools has had on their families.
It is more than five years since the government first promised schools in England these guidelines - on issues including what toilets and changing rooms pupils use, where they sleep on residential trips, and when to involve parents.
Names have been changed to protect families' privacy. We have used the same pronouns both parents did when talking about their children, whose birth sex is both female.
At the age of 16, Briony told her parents she identified as non-binary, and wanted to be known by a different name and use they/them pronouns.
Briony's mum, Rachel, had been concerned about her daughter's mental wellbeing for several months and could see she was struggling with something - but it still came as a shock.
Rather than accepting it immediately, Rachel felt it was important to explore and understand why Briony felt this way. But when she spoke to Briony's all-girls school, she was told staff and pupils there already knew and had been following Briony's request for months.
"They had just gone along with it - I was shocked by that. There was no clinical or medical input," Rachel says. "What the school has done by taking the actions they did undermined my parental responsibility. It's not for them to make those decisions."
