My interview was just chill, since I had a lot of works to show, I felt the time go past extremely quickly. The professor: Murray Fraser was such a nice guy, he seems to be an easily amused person :3. He was actually playing and making sound effects with one of my sculptures!
In terms of portfolio, they want to see the process of your work. Explain to them how your work is developed. For example in A-level Art, you might have a few studies which lead on to your final art piece. Tell them your thoughts, or they will ask you about it anyway. Most important thing is...be yourself, because they chose students who are suitable for the course. If you don't be yourself, you will most likely to drop out. 1/9 of my year already dropped out, I am a current year 1 student at the Bartlett xx