For an entry level opening such as ops assistant for a freight operator, you will need to show an interest in the industry and the company. When was the last time you read Flight International or a similar industry journo? Could you tell me a recent news story in the industry?
Obvious company questions - how it all started, present contracts, routes, fleet. They could ask you basic world geography (match city with country) or some basic maths questions. (speed, distance, time and fuel calculation perhaps given two of the three numerics). Also the usual interview questions - personal qualities, etc. Perhaps the hardest question of the interview - why do you wish to work for Emerald?!
OR the interviewer may just talk for an hour!
Considering you live near MANchester, will you be able to commute easily to LiverPooL on an ops ass. salary?
Finally, based on everyone elses postings, you could view a job with Emerald in two ways. Get your 6+ months experience and move on in the industry, or the experience itself could put you off aviation for life! I have nothing to do with Emerald, but if you are absolutely keen on getting into the industry...