Hmm a bit late to reply so if you've had the interview, hope it went well. Otherwise: the day itself is quite informal, with a few talks (one was about accomodation), a tour of the dental sch with a dental student, a trip to the dissection lab and a visit to the union for lunch. The interview is quite formal but not nerve - wrecking. Just be honest and remember things from your day in Sheffield as they may help you answer questions.