Recently, some areas in the UK are adjusting how digital TV signals (DVB-T, DTT, Freeview) are broadcasted.
See this site for more info:
For EyeTV users, this switch means you will have to Auto Tune again.
1) Open the EyeTV Programs window.
2) Visit the Channels section, and select your Service at the bottom of the window.
3) Press the Auto Tune button to scan for channels. This will let you acquire the correct channel list.
You may also need to adjust your Smart Guides, Schedules, and Favorite Channels Lists, to make sure they have the right channels selected.
See this article by an EyeTV user for some additional tips: