I applied online and had an invite to interview less than a week later. I couldn't make the time that they had arranged as I was already away visiting family but they were extremely accommodating and quickly changed the day for me, which not many companies do. The interview lasted about 10-15 minutes. The interview was really relaxed - the interviewer was extremely friendly and as well as asking the questions also explained them a little bit which helps to guide the answers. He also gave me a chance to expand on my answers if he didn't think I'd said enough. I would say definitely research the company - I spoke a little bit about the charity work that the company does etc. and he seemed impressed that I had clearly done my research, and he also asked me if I knew how many countries they were in (luckily I did). All of the interview questions are marked out of 4, so make sure you really elaborate on your answers. I only had my interview 2 days ago so I haven't yet had a response, but it was overall probably the best interview I've had.