Pace STB and Pansonic HDTV

Quick dumb question with hopefully a simple answer

Got a new tv Panasonic TX-P50GT50B
Trying to hook this up to my UPC Pace Digital box, its on old model with scart.

The Pansaonic came with a Scart to AV adapter.

So first hooked up the scart from the Pace STB to the Scart/AV adapter and connected to the AV input of the Panasonic.

Then tried to tune using the DVB option - no channels found
Then tried to tune using the Analogue option - no channels found

The only way i can have channels is by taking the RF cable and plugging directly to the RF input on the Panasonic (bypassing the STB)
:ie the analogue signal as per this method
http://www.boards.ie/vbulletin/showthread.php?p=81340012

So what am i doing wrong here?
Do i need to contact UPC for a new set-top box?
I was not planning a UPC HD upgrade.

Thanks in advance for the help