Will they even accept a transfer into second year? In the UK it's pretty uncommon for students to transfer into higher years of a degree. It's possible but not guaranteed. More typically if a student is changing university (even remaining in the same subject area) they will typically have to reapply to start again in first year.
In any event on the social side, you can participate in freshers events in any year of your degree. Lots of people participate in freshers every year of their course. It's just an excuse to go out and do social stuff really.