30 mn phone interview, asked questions about my interest in the position, why I chose this field, my studies, my coursework and a few competency based questions (what would i do if I have difficulties carrying out a task, teamwork etc.) At the end, I was invited to a face to face interview in their London offices, a week later. I was subsequently contacted by email and offered with several time slots over two days. The interview laster for one hour and was quite informal

Presentation by some staff members, followed by a group activity (teams of 6) in which we were given a scenario. The scenario was that we were on a raft in the sea and had a list of 15 items, and had to rank them in terms of usefulness, then present as a team why we had ranked them in that way. After a provided lunch we then had individual interviews with 2 staff members which lasted 30 minutes. This seemed a bit short to me. The questions were very sustainability based and they encouraged/provided guidance throughout. Was quite informal although I did wonder how it was relevant to the job as I was interviewing for a water quality/contaminated land position and have not studied sustainability.