If you are a Home/EU student you can set up a Direct Debit at the start of term which will be paid in two instalments. More information is available here: http://www.swansea.ac.uk/undergraduate/enrolment/howtopayyourfees/
Postgraduate Taught/Masters students can pay in the same fashion. Postgraduate Research students can pay in two installments, but the dates are dependent on when you enrol. Please consult the following web page: http://www.swansea.ac.uk/postgraduate/enrolment/pay-your-fees/
International students must pay at least 50% of their fees before they enrol, with the next 25% due in February and the final 25% due in May. More information can be found here: http://www.swansea.ac.uk/international/students/enrolment/pay-fees/