I applied for the role online and got an initial phone call and was put forward for a 1st stage interview.
The interview instructions gave me the outline of what I needed to prepare for - Case Base Study, Competency Based Questions + Change Management Presentation.
In preparation for the interview I contacted http://skillfullydone.com/ and got some excellent interview prep and advice on interviewing with the big 4 - I cannot recommend and thank them enough for the help and input that I received from them.
The Case base Studied worried me at first, but it was all relevant to the role i was applying for (Service desk stats, charts etc) so I was happy about that.
Questions were all based on tell me a time when you,.. how would you deal with a difficult employee etc. My interviewees at Deloitte were very welcoming and found the whole process invaluable.
Unfortunately my current stakeholder experience was not strong enough for me to progress any further.