Cool, seems to be a fair few jobs in the area, am i right? Think there is a fair few qualified to do it as well though.
I suppose with jobs like that it gets quite technical, and is very much down to what you tested previously, what programmes you are comfortable with etc. So then if you tick those boxes its all about personality.
Google your interviewer, or talk to someone who may already work with him. Find out what he's into, try and use a story that may bring up a conversation with it, maybe sporting analogy or whatever. If you make it a chat and the actual job is half forgotten about, your on the pigs back.