I've stayed in plenty of halls of residence (as a student, as a conference delegate and simply as a visitor) and I've never seen safes in the rooms. Further, when Sheffield Uni's student rooms are made available to the public and event organisers during vacations, there's no mention of safes within the rooms:
http://withus.com/conferencewithus/rates/room-only/
Thanks Buenchico - my grandson is at De Montford and had a small one on the wall, my granddaughter is going to Sheffield which is why I asked, as I had been going to buy her a small strongbox for any jewellery/documents she may need to store - being a student she won't have spare cash to go in it!!!!!!!!!!!!!!!!!!!!!!!!!