There was 5 stages in total when I was applying for this position. The process was rigorous, time consuming and requires a lot of preparation. I found the group interview quiet challenging.

Online application followed by online assessments then onto a group interview which took 4 hours so be prepared for the long process. Hard to get noticed in the group setting as there was a good few people so try to be heard but not aggressive when trying to get your points across. Many people there had a masters degree rather than a level 8.