Well all freeviews are to be re-tuned now. I'm guessing your freeview will be built in the tv?
To re-tune:
1) Switch on your Freeview TV or box
2) Using your remote control, press 'menu'
3) Select the 'set up' or 'installation' option
4) Press 'OK'. If your equipment asks if you want to delete all your channels, don't worry, that's normal
5) If you are prompted for a code, try 0000 or 1234
6) Channels will be automatically installed. This may take a few minutes and your equipment may shut down and restart
7) After re-tuning, you may reset your 'favourites' list. When you re-tune a digital TV recorder, you should re-set future recordings