The process consists of 3 steps. The first is a phone screening with HR, and then you have a longer interview with a line manager before another short interview with a director. The whole process is actually quite quick, about 3 weeks. The interview with the manager lasted about 45 minutes and there was no business case presented, just behavioral fit and motivation, if you are applying for a specific sector I would advise to gather some information about it before the interview as it will give you some extra points.