Well, I finally got a disk to format correctly and burnt my image onto the disc.
Unfortunately, trying to load them using the WiiGator BackupLoader I get a
"DVD Read Error (324)"
I've tried uninstalling reinstalling IOS0249 as had been suggested elsewhere but with no luck. Maybe it's my DVD's, they are only Tesco make afterall.
What's the recommended DVD type, I'm using RW+'s at the moment but I've heard DVDr- are the best.