Hmmm, just checked this on V+ box, ex TW Blackpool, and the piccys show and no mention of not being subscribed, even though not subscribed.
Quickly flicking through TV guide they all run 10:00pm - 6:00am, on the screen in minute writing it does tell you how to lock the channel.
Just checked and if you press HOME, then select settings, then locked channels, after entering PIN you can lock channels out. If you press yellow, it will hide adult listings
HTH