try the number on this page:
click!
i know it has dates for the 2004 days, but it's worth a try.
if not, you could always ask your teacher about it - they should have received an information pack with all the details inside.
i'm pretty sure people had arranged to pay on the day when i went last year, but it's probably best to ring up and make sure before you just rock up unexpectedly.
hope it works out for you!!!