That is because BBC, ITV etc, are still transmitting in Analogue. and come down your ariel lead. Your Freeview channels will either be on channel AV1 or AV2, depending on how many SCART sockets you have and which one the TV is plugged into.
The downside is if you want to record a freeview channel, your freeview box will have to be on that channel for it to record. So you won't be able to record one freeview channel, whilst watching another. You could buy another freeview box and link that to your liteon.
Hope this helps.