I applied online. I interviewed at University of Cambridge
Interview
They asked multiple questions about previous research projects. Follow on questions about specific topics to probe general scientific understanding. Final question about motivation for pursuing a PhD. Had 2 rounds of interviews with 4 people in total
Interview consists of 3 parts (written and 2 face-to-face). Written test, then interview with the manager and interview with the Director. Written test is technical to test your excel knowledge (basic level), oral interview is more to know you as a person and test your knowledge on Data Protection.
Very Technical and requires knowledge of calculus combinatorics, basic statistics and mechanics. Interviews mimic the teaching style at the university which are supervisions. This stage simply tests if you are teachable.