my dd is 16 and most of her friends stay out in a village until 11pm /12am in the summer and I've said that's completely not happening in our house. It's only a 15min drive and the majority of her friends live there. I know most of them and they are all REASONABLY safe but I know the boys smoke weed and dd does NOS quite a lot. AIBU to say that 9pm is the curfew.
Also would help a lot if you let me know any of your dd/ds freedom in the summer after gcses