Common behavioural questions the asked me to do a case on a manufacturing problem scenario. It was basic, not too much to it. Had plenty of time to answer and could use a calculator.
I interviewed at Stroud International (London, England)
Interview
Aptitude test and interview if you do well on the aptitude test. The aptitude is physics-based. Prepare to explain a technical concept to the interviewer. Also, about something you are passionate about.
Very fun interview process with 3 round of interviews. The first round was a 15 minute call, then an assessment centre and then a final individual interview. The initial 15 min call was fairly straightforward with 4 questions asked, and the assessment center was split into 2 parts, with only 5 people progressing to the 2nd part.