well the panel here was the most i had been interviewed by, but dont let that put you off. just be prepared for the obvious questions .. why do you want this, why are you suitable. im not sure if your supervisor to be would be on the panel, in mine he was not, so the questions at that stage were about dissertation topic and my research work in placement year. so as long as you know that inside out its a good start. read up on the project and references given and you should be fine. try seem as enthusiastic as possible and ask lots of questions! good luck