So, I emailed tbs, they did respond and say they are trying to look into it but I haven't heard anything for a while, though I do have a slight bit of progress.
I have a dual dvb-t card, and dvb-s card and a dvb-s2 card. I couldn't get wmc to pick up dvb-s2 channels since getting that card, last night I did a clean reinstall, leaving out the drivers for the dvb-s card.
I was able to scan a single transponder to get the hd dvb-s2 channels I wanted (bbc, itv and channel 4). I then installed the drivers for the dvb-s card, wmc asked me to do anther tv signal setup, and after I did it lost the s2 channels. I rescanned the single transponders but couldn't get it to pick up a signal again.
I've restored to a point before adding the drivers for the dvb-s card and am now rerunning the tv signal setup, but even if it works it will just wipe it again if I add the dvb-s card again.
At least I know the card works, it's just a wierd bug within media centre (I've been posting on the windows experts / greenbutton too)