Luckily, I was able to sort it out - I over-wrote the Xorg.conf,xorg.conf.avwizardr and xorg.conf.avwizard with the one that I got Xorg to generate (which worked with the normal KDE desktop).
Then I found the bit in the wiki where you can stop Avwizard from editing Xorg.conf, and added that part into the file. This enabled me to get AVwizard up visible, so I could carry on from there. UI2 all up and running now!
Thanks anyway though!