Don't worry, the interviews are easy. I had one at Manchester, which is meant to be the toughest but only lasted no more than 5 mins. Don't know about UEA though. However Manchester asked me the obvious one first, why pharmacy. Just think of something original and not "because i enjoy organic chemistry" like everyone says. I was then asked whether anyone in my family is under any medication. I said I take loratidine for my allergies, which is an antihistamine. So learn some names of drugs. Then he went on to say, this is not an interview or a chemistry test, this is more of a chance for you to ask us any questions you may have. Have some questions ready, I asked how is the course split in terms of practical work and lectures/tutorials.
Anyways, good luck, you won't need it.