My uni does offer the opportunity to pay in instalments, 8 I think, but this may incur an additional fee for the privilege?!?! I have usually paid the entire amount at the beginning of the academic year so that the fee quoted is what I pay and no more (as it is not cheap at my uni!). The payment is done online and when you go through this process it allows you to request payment in instalments. An email confirming the payments then follows and the amounts are done by debit from your bank account. I would try calling them to confirm what has to be paid and how much extra it may cost etc.