I applied online. The process took 2 months. I interviewed at BAE Systems (Lancaster, England) in Dec 2018
Interview
Initially, had to complete online questions followed by an online hirevue interview. Next stage was an assessment centre which involved a 1hr interview with two interviewers. There were no group tasks or presentations to give.
Interview questions [3]
Question 1
Various technical questions relating to BAE projects that assess your thought process. Unlikely to know the answer but interviewers help guide you through the process.