After sepaking to a few admissions tutors, second year entry is pretty tough. You miss out the fun of starting uni life in the same boat as everyone else, you are already expected to know everything that was covered in the first year and you should have adapted to the learning style.
All in all, not the sort of thing i'd like to be thrown into, but each to their own.
OP: If you want more specifics about the uni's, post in their specific sub-forums. Better still, go have a look around.