A 1-to-1 interview of about 30-45 minutes which wasn't particularly difficult, then a group 'assessment centre' featuring pretty basic team exercises. The 1-to-1 primarily consisted questions relating to subject matter from my specific application, so asking about my specific skills, experiences and qualifications. The group assessment centre was primarily designed to test your ability to work in a team, with small groups assigned tasks such as building a house of cards, with no instructions as to how best to do so.