You need to buy a Digital Set-Top book - Freeview boxes don't need a subscription as their name suggets.
Then plug the output SCART from the Set-Top box to the "AV2" input SCART on your appliance. Using your remote, press the programme button to select "AV2" programme mode. You then control the channels using the Set-Top box remote control. In AV2 input mode, your recorder will record whatever the box is showing.
Hope this helps you
Peter
March 2010