Hope its not too late...
When i had my interview (a few years ago i know... but these things don't seem to change that much) we got a piece of paper with a few basic questions on it. I got a picture of some made up molecule on it and was asked to identify different chemical groups. Can't remember what else was on there.
Anyway, they also ask you a few questions in 1-1 interviews: such as why pharmacy, why cardiff, the obvious things. They may ask you to name a drug and say what it does. Or say how drugs can be given, other than tablet. In cardiff i was asked about recent developments in pharmacy and the guy went on about stomach ulcers and a nobel prize, blah blah blah. Anyway, just relax and be yourself - thats what they really want to know about, you.