Ok let's say something..
I didn't eat anything (too nervous), so I don't know how the buffet was.
When I arrived an undergraduate told me that probably they were going to test my skills, because I wasn't doing A-levels. Before the interview ++++ told us that we all would have got offers. My interviewer was really interested about my EC's, we talk about them for a while; then she asked me if I had questions for her and then we changed topic. No technical questions at all!
I enjoyed my interview and I wasn't nervous because we talked about me.