More and more departments are making use of fixed application periods for third-cycle programmes.
However many departments still admit doctoral students one by one during the academic year as and when supervisory capacity becomes available, positions for doctoral students fall vacant or applications are received from students with 'other funding'.
Applications to third-cycle programmes are made directly to the department in question. There are often special forms for applying for a doctoral studentship and for admission to the programme itself. Ask the department secretary or someone with responsibility for third-cycle programmes. You are often required to include a funding plan for the duration of your studies with your application.
Decisions about appointments to doctoral studentships cannot be appealed.