Well done you too!! I have not heard from Staffordshire either yet, but TBH it is my last choice, I didn't much like it at the open day, but I loved everything about Teesside.
Interview? not sure really. I will just make sure I am clear about everything on my personal statement, but it was all 100% truth anyway, so I should not slip up there, and also be clear why I want to do the course.
Good luck! I am sure it will just be a formality.