CV review, then first round was group discussion, sort of like a round table discussion. The topics we were given involved discussion of environmental policies in UK and the climate change, sustainability. The day also involved a math test with an essay. After two days, i got the mail saying that I got through to the second stage and invited me for an interview two weeks later. The second interview was with the directors and it was a fair discussion of my skills and priorities. It was quite nice interview and the interviewers were relaxed about the whole process. The third round was a final interview and this time,I didnt make it. The whole process was quite fast compared to similar companies.