ITV2 and ITV3 will be available to terrestrial viewers in the Channel Islands from today.
Islanders will need to re-tune their televisions and digi boxes after midday to receive the new channels.
Terrestrial television (Freeview) viewers in Alderney and parts of Jersey will also need to re-tune their sets today because of changes at the transmitters.
While the work goes ahead all channels will go off for about an hour.
For detailed re-tuning instructions of popular makes & models visit www.digitaluk.co.uk/channelislands or phone 08456 50 50 50.
For any other questions regarding the additional services of ITV2 and 3 contact ITV Viewer Services on 08448 81 41 50.