It all depends on when your classes are & what your tutors are like at the end of terms. Doing something like IR & Spanish I'm not sure how many classes you'd miss in a week, but it won't be as many as a science based subject. I would see how the first term pans out & see if your tutors would be ok with you missing the last week (I can't see how they wouldn't & if they aren't keen, just claim you were ill that week, they can't do anything about it!)
With the changes in term time, I'm not sure what would be happening in the last week of term. Exams might be just before Christmas, or they might be straight after (as a final year student I haven't been paying too much attention to the change in term times happening next year). The only issue might be that you have exams in the last week, which you can't miss. Or, if you're lucky, it will be a revision week, so won't matter if you're not there.
I would wait & see how things happen next term. Best of luck with things.