Very strange interview. Most of the questions were relatively straight-forward, which was fine. Interviewer was very serious and straight-faced, went on a tangent about how this is not a 9-5 job, you're expected to put extra hours in, how he doesn't believe in job-hopping and would make me promise to stay at least 2 years it I got the job. Asked if I was used to this format of interview which I thought was a very strange question at the end. Also gave no feedback to the recruitment firm who kindly arranged this interview.