Heres a run down of the interview prosses...
After filling in a eligibillity questionaire and enjoying free coffee in the foyer, you will either go for a group discussion and group excercise or go for a two to one interview. Then vice a versa.
Make sure you know all about BA and prepare well for all the questions they will ask you. for instance, what culture is alien to you, examples of good customer service etc(see previous threads for info).
Great bunch of people.. however, didnt get the job.
No matter, good luck for the future.. its a great career choice.