Dear Student
Bla Bla Bla
If you haven't pre-enrolled, turn up on the 20th, but if you have, come on the 23rd.
Your Sincerely
Dr Pamela AC Watt
Course Leader
Now I remember filling out a form for my unit choices, but I can't remember filling out any-kind of enrolment form, and I certainly haven't received a 'you have been accepted' letter. So it looks like they will be hearing from my mouth again tomorrow.