Behavioural, really straightforward and pretty easy questions, chilled atmosphere. Wouldn't get too stressed for it. The test before the interview was really challenging though. The algebra was fine albeit you don't have much time so you have to rush. The pattern part was really difficult though.
First round was a case interview and final round was a behavioral interview with a more senior member of the team. Each interview was 45 minutes with one member from the team.
There was only 1 round of interview. Heard from recruiter 1 month after submitted application. Interview was 1 hour and did not seem structured at all; it went over a mix of technical and behavioral topics.
First stage of CV application, followed by an in-person assessment centre, then final interview with hiring manager in person in Southbank London office. Many assessment centres were running throughout 2017 when i applied.