Very formal process: values interview then portfolio case study presentation, then an assignment (they gave you a choice between 2 assignments and a week in advance to prepare, and then you presented your research/ideas in 15-20min with about 30+ min for Q&A). It was all done in person at the Edinburgh office and everything took about 3+ hours with a bit of waiting time in between so occasionally you'd be able to chat to other candidates between rotations. Tasks had 2 interviewers each, and you will be alone in the room with them.