Hey Steve,
Aye, I'm sure you've already checked that video on the faculty website (the one with the 'funky' music) which outlines the procedure from the view of the students.
The girl says it's no problem if you have a good motivation letter. It should be conducted on Skype too so check out some tips for that- Lighting, what to wear, looking at the camera not the screen etc.
I realize that's not much help. I had until recently been preparing for the interview but got my acceptance confirmed the other day which, again, isn't helping you much.
Let us know how it goes mate!