hi sheena, i am an international student myself. at my university the write up fees for the year is the same for everyone, home/international. the home office does extend student visas for PhD students doing write ups for a whole year. after the write up year if you havent finished at my university you will have register paying the full fee. i think it differs with universities and if you look at the home office website you will find infor ref- write ups. are you studying in the uk? well i am assuming u are!