I did the interview recently with one of the recruiters and a TRE not working for cityjet but doing the sim assessment and interview as a freelancer. Most of the interview consisted of capacity based questions in the form of "have you ever experienced this" "tell about about when that happened to you". Fairly standard questions but just a lot of them.
As for the technical part I got a few questions about alternates, fuel requirements, cold weather ops. We did not go into detail but merely touched upon the subjects lightly.
Then I was also asked what I knew about cityjet and whether I would be interested in a base other than the one I had applied for.
All questions came from a cityjet document and the answers were written down and forwarded to the appropriate department making the final decision. In my case the interviewers did not stray from these questions so there was not a lot of room to steer the interview in the direction you might want.
All in all a relaxed atmosphere and no funny tricks during the assessment.