Interviewers were extremely friendly - some tricky questions but overall very standard. They aren't looking to catch you out on any questions. However, the interview process is quite long so make sure you stay focused throughout.
I applied online. The process took 2 months. I interviewed at BAE Systems (Portsmouth, South East England, England)
Interview
Easy and quick with the telephone interview lasting 20 minutes. The assessment centre was the easiest one I had been too. However it was based at a hotel which means that you can't view their offices or where you might work in the future.