Hey Connery. I'm at Uni of Leeds and I do German and Italian, but I just dropped Italian to do SH German in my second year.
It shouldn't be a problem. You'll just have to go see the Joint Honours for Modern Languages people, who are the nicest people ever, and apply for a change of programme.
It then has to be approved by the head of department (Italian in your case) and if it's ok then you'll be moved.