My eldest has just started at secondary school. The school Facebook group for the school is awash with angry parents saying that they did not know the toilets were unisex. Older parents are saying it's a new thing for this year. I've spoken to my daughter and she says she refuses to use the toilets at school because of this. She can't go 7 hours without a wee and holding it can lead to urinary tract infections. What's the best way to deal with this with the school?