1992
Historically you will not be able to choose your base unless you are joining as a DEP, even then it will be down to what's available.
If you are a low houred wannabe then you have to be prepared to move anywhere on the network, at the interview (or after on the phone) they will most likely say "welcome to flybe, your base is xxx", you may be told at interview what bases they are recruiting for, and if you show some discontent that this you will probably not get the job.
Once you have accepted the job you can then bid for the base of your choice every 6 months, I know of 2-3 f/os who started before me who bid for a base closer to home and had it within 8 months, but this is dependent on base requirements & movements etc.
Again historically flybe recruit for the northern bases, i.e. EDI GLA BHD & IOM, we are desperate for f/o's in JER apparently.