You shouldn't need to get the injections before enrolment (they'll usually give you at least a few weeks into uni to get this sorted out) - the faculty should provide you with a list of what vaccines you need to get. Generally speaking though, you'll need DPT (Diphtheria, Pertussis, Tetanus), Tetanus booster (if required), MMR (Measles, Mumps, Rubella), Varicella (chickenpox) and Hep B.