On the 12/10/2012, there were several changes to BBC Channels.
Sky Digital boxes and most Freesat Boxes should update automatically, however this does not seem to be the case with Humax receivers.
You may need to re-scan your receiver.
The following Channels have been affected- BBC North East & Cumbria, BBC Three, BBC Four, BBC Alba, BBC News, C Beebies & CBBC
There are also likely to be more changes over the next few days.