Comment by cjk2

You can decline this at any age. What can they do? Well turns out at that point they can only threaten to or apply violence or confiscate it until you hand over the details, none of which are "reasonable in all circumstances" as quoted in the legislation.

So the correct answer is to tell your kids to tell them to get fucked and call you. At that point, remind them that the device is your property, decline their request and they can only threaten you, which is 100% illegal.

I am more worried about the teachers from experience than the other students. Some of them I have encountered over the last 15 years of having three kids at school have been right nasty pieces of work and should not be in a position to have power over a minor.