You are right to wonder about this but a couple of things to be aware of. First, you may not be the only fresh face in L5 - there may be others joining directly, others returning after an interruption of study, etc. Second, if the cohort is quite big then it may be the case that existing students only know a small number of people from their L4 project/seminar groups. L5 is where module choice increases and students begin to mingle with people they don't know or people from other courses.If you do end up joining L5 directly, and the cohort is quite small, I would hope that you would be allocated a student mentor for the first few weeks (this is something to ask about).