There are a lot of suggestions here, but just do as much as you have time for. Some parts may be easier for you than others – but even if you have only looked in a few places, it's still worth approaching the school.
Sex Matters response to More in Common - Sex Matters
Information Commissioner strikes down secrecy of Stonewall scheme - Sex Matters
Send “Trans” to a friend! - Sex Matters
Practical ideas for parents of gender-questioning teenagers - Sex Matters
The EHRC steps up - Sex Matters
Comment on the schools guidance – even if you only have five minutes - Sex Matters
Sex and gender: belief and agnosticism after Forstater - Sex Matters
Where is the easy reading version of the conversion therapy consultation? - Sex Matters
Please, please make it stop. - Sex Matters