Unusual interview process. Was invited to a networking reception for shortlisted candidates to meet with regional director and senior managers. I was told there would be 3 rounds of interview (1 behaviour, 2 case studies) for selected candidates. Came in to the interview expecting behavioural but was surprised when they told me it was the only round and it was a case study. Whole process took 2 hours (1hr case and 1 hr review of case). Interview was both technical and qualitative so you won't know how to answer all the questions. They really just want to see how you think. Ask a lot of questions!