After submitting my online application, was contacted within a week for a phone interview. Phone interview consisted of basic fit questions, with no technical questions asked. Lasted about half an hour. Received an email about a week later inviting me to final round interviews at the London office. Final round was an assessment centre. It started with a senior employee talking to us about the firm and telling us more about Investment Consulting. This was followed by a written exercise based on Towers Watson research papers we had been asked to read prior to the interview, and a fit interview with a manager/senior employee. There was also a group exercise where we were supposed to rank the most important inventions in human history. Lastly, there was a 10-minute presentation on our recommendations for a pension fund regarding it increasing or decreasing its exposure to emerging market debt and equities. Got asked a range of questions by my interviewer about the presentation, ranging from "What is QE" to more difficult questions about the various asset classes. Overall the assessment centre wasn't extremely difficult- the presentation was the most challenging aspect. My biggest complaint was the lack of constructive feedback provided by HR, a view which almost all of the other candidates at the assessment centre shared. HR went on for minutes about how my "presentation delivery could have had more impact" though I excelled in all other areas, which struck me as a rather contrived reason. Constructive feedback would have let us understand why we didn't get an offer and helped me in other interviews, so I wish they would have put in a lot more effort on that.