The UK TiVo tuner requires a strong signal for it to allow reception. Even if you get nice clear pictures on a TV this does not mean it's good enough for a TiVo. If your TV only has an average picture, chances are your TiVo is not going to work 100%. In that case you may need to install a signal amplifier or adjust your aerial / cabling.

The other thing is it may not be tuned for your location. You have not entered any city or country into your visible profile. If you are not in Wellington or Auckland, the local frequencies may be different for your area.

Peter.