Looking at some of the other current threads about Emerald and the points being made about ops and the person they work under, my advice to you would be to stay at home on the day of the interview and forget all about it.
If, on the other hand, you do take the interview some of the qualities they will be looking for are things like, the ability to be manipulated by management, the ability to disregard CAP 371 as much as possible, the ability to take being sworn at by pilots when you harass them on their days off, holidays, and at stupid hours of the morning when they're asleep, the ability to salvage situations that arise when you run out of crew and/or aircraft, and generally to be able to put up with what is a very stressful, underpaid and complicated job within a very under resourced department. There seem to be only a few battle hardened ops staff that have been there for any longer than six months or a year, the rest tend to pass through quite quickly.
Now before any one replies to tell me off for slagging down the ops staff and the work they do, that's not what I'm doing and I'll reiterate,- it's not the people in the department that are responsible for it's short fallings, it's merely the insufficient resources they are given to work with.
If you get the job, good luck, I hope it works for you.