Hmm... I lived in Leeds for a year. Next to one of the poorest neighborhoods, called Little London. I do have to say I felt unsafe at night, the kids living over Little London were really aggressive. During our few night parties, we had a couple of girls beat up and mugged by those kids.
People in Leeds say that crime is high due to the large population of students- and burglars knowing how distracted they are. So it's easy to get inside the houses and steal what ever they want.