I had the same thing when I applied for Servisair dispatch. Throughout the interview they were pushing me towards checkin due to my lack of experience (I went into dispatch fresh from college with only a weekend job previously). I stuck to my guns and by the time I'd driven home I had a phonecall saying the job was mine and if I could start two days later
I started on the 20hr p/w contract but I was rostered to about 28hrs per week. Not sure what the traffic is like over in Belfast but where I work there was overtime going all day every day with the holiday charter delays etc.
As said previously, don't expect anymore than £7 an hour. On a temp contract you probably wont get shift pay, night pay etc etc so you'll be looking about £6.80 an hour
Good luck!