I did a couple of modules with some Forensic Science ppl at UCL.
It used to be an MSc-only subject until recently, I think they're just starting to take undergraduates now.
I don't think there are any requirements, but Maths & Stats would probably be a good idea.
EDIT:
That was if you're looking at doing Forensic Sciences straight up. If you want Criminology, I don't know. But either way - if you want to be a Forensic scientist for a living, Literature, Classics, History doesn't seem the way to go. Need at least Maths and maybe a science.
Criminology doesn't teach you to be a forensic scientist. It's about understanding why criminals do criminal s**t.