They are locked on your box because they are subscription channels. (That is to say they are not Freeview.) To receive them, your set top box has to have a smart card slot. Then you need to take out a subscription with TopUp TV.
Terry
January 2007
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix dtt receivers.