If you want to stay in university accommodation for your PhD as well they have asked that you log in again and apply for accommodation for the 2015/2016 academic year. So you fill in the same application again but put different time period down. I would suggest you put down a date to start the new contract which coincides with the pre-sessional contract finishing. So if you last day for accommodation contract on the pre-sessional is 1st September you book the new room from 2nd September. It may be better if you book for the whole academic year and you can cancel before the contract starts if you find after pre-sessional you don’t like University accommodation.