Scopiton,
You seem very keen on EasyJet!
There is no guarantee that they nor any of the other partner airlines will hire you. However, CTC claim that nobody has finished the course without having an offer of employment from an airline, subject to 6 months line training. There is a holding pool for cadets to enter should they not be taken on but as of yet, nobody has entered it.
Im not sure how it works in terms of who takes who but if BA turn up wanting the best, thats what they will get. Some people prefer working for a low cost carrier to start off with, as pay increases quicker and you generally get more hours under your belt faster.
Best of luck to you.....
socloss