I applied online. The process took 5 weeks. I interviewed at UK Atomic Energy Authority (Culham, England) in Nov 2018
Interview
First, I had half an hour to solve progressively challenging problems. These were mechanics based problems. Then I gave a 10 minute presentation of my previous work. Make sure you don't run over time. Then there was a chat for 30 minutes. Then there was a tour from a graduate; this is still part of the interview so don't let your guard down.
Interview questions [1]
Question 1
How have you dealt with a situation where there was conflict in a team?