I interviewed with PSB Insight London. The interview process was friendly. Offered feedback after the interview. Had two stages, one over phone and one in person in London office. One of the task was to analyse a data pooling data set and create presentation on it.

One 30min phone screener asking about initial qualifications for the job. If you are successful, you are given a project that you must complete at home within a week. Then you are invited to a 2 hour in-person interview session that includes three different 30 minute interviews with two colleagues where they ask about your project as well as other behavioral and experience questions. If you make it through that interview round, you might be subject to a final interview with a VP before being offered a position.