Well they asked me this, and I talked about the course mainly, but I also mentioned the research. Go on the website and read about any research going on (I think using stem cells to try to cure parkinsons was the example I used). Check this, but i think 15departments at Bristol scored top marks for teaching, and whats more its a beautiful city.
A general tip though, when they ask you about medical research or something alike, mention something you can talk in depth about. I made the mistake of saying 'robotic heart surgery' for about 5 questions to follow on adv/disadv, morals and ethics etc and I really had to think on my feet as I hadnt done enough research.
As the above post states, its a relaxed atmosphere just be yourself, they are only human beings after all, and you will be fine.
Best of luck!