There were a couple of technical questions that I struggled with and they actually worked through them with me. Despite that I felt the interview went well as they were very relaxed about it and were keen to help me 'learn'.
With regards to the sim, I thought it was OK. It wasn't as good as some of the flying I did in my MCC/JOC but I was generally happy with it. I started off quite sloppy but did improve throughout, I believe that's the main thing they're looking for
