cheers bro, i didnt have modified-hildon-desktop installed!
its working great for me now
couldnt get extra wallpapers to work, but after applying an image set to the original 4 desktops i opened the .backgrounds folder and added my own 4 images there, then renamed the 4 i had put there so that the file names matched the 4 from the image set, and changing the numbers in the file names to 5,6,7,8 as im running 8 desktops now
if that makes any sense!