My process was divided in 3 main step: 2 Telephone Interview. An assesment day in the central office at London. The 2 telephone interview were quite easy, i just followed the question founded on glassdoor. The assessment day was a bit challenging, not for the overall difficulty of the question but more for the given time to resolve them. The math test is totally based on mental calcolation as 12546742523*213455, and so on.. That's why it's need more time than expected. During the assessment day you have to do also 3 interview with 3 different manager(HR, Project Management, Technical), the interviewer were soo friendly and the questions easy to answer.