Three rounds of interviews with increasingly senior staff members, including some practical on the spot briefs to complete. First met with the existing copywriter, fairly informal chat followed by a creative task, then a chat with a member of the creative management team. Third chat with another more senior person, took 3 hours in total. Second interview started with a creative task followed by a chat with a few of the people previously met and another senior member of staff. All very friendly, weren't trying to trip you up/be overly challenging, sounded genuinely interested in finding out about your background/skills.