Well erm, schoolboy error... for some reason I had the input on my amp set to dolby digital rather than DTS... DTS flashing symbol on the amp was obviously trying to tell me that!

Set it back to auto now...
Things are looking better. Have component input now using 720p, my panny pwd6 doesn't support that but it's very good at downscaling. Picture is ok, not brilliant but not too bad, skipping\juddering has gone now. My std DVD is a Harman Kardon using component\progressive output so I wasn't really expecting the same picture quality. Might try a VGA cable to see what that is like, don't really want to buy another component board...