I'm currently in my final year of university too (not at Sheffield) and I was amazed at how many announcements had to be made during the recent exams (2 weeks ago) to correct questions, some multiple ones per paper.

If it's only a 3-4 page exam, with only 3-5 questions in total, they should probably have been read through and attempted by a couple of lecturers beforehand.

What made it even worse was that I am at a Welsh university, so announcements have to be made both in English and in Welsh. Disrupting anybody doing a different exam and causing hassle for the students taking the incorrect one.