What's the point of this if the older child of the family just comes down during the early hours and just Hard Reset's the router?. Is there no other way as i don't want them using it beyond 1am!.
Interesting. You say that it doesn't re-apply the block once the start time has passed and the router is reset? If so, report it to BT as a bug.
As i mentioned on another thread recently, there's no real fix for this - if the kids have physical access to the kit (even just the phone line) there's always a way round it.
I did a project a while back in a few children's homes to provide internet access - locked comms cabinets in locked staff offices, line terminated inside the cabinet, plus ISP-end content filters and access control.