Tivo can be connected to any sky digibox and will automatically change channels when it needs to make a recording.
Simply connect the digibox SCART to tivo AUX SCART, and set the code for your make and model of digibox (its on the tivo menu setup / recorder & phone/ set top box control )
Most use code 20016 under manufacturer "Sky Digital"
Replacement TiVo Remote
If your original tivo remote is lost, or just worn out, buy a brand new replacement silver remote. Also useful to keep one in each room if using the tv link plus system or similar to view tivo in different rooms.