It is straight-forward. HR sent you an email for the time slot for you to sign in, There are 2 round interview, one with 2 analysts at the firm on Zoom, and the other will be the case interview.

The major problem with this interview was, that Compass Lexecon did not reimburse my travel expenses from continental Europe to London. The interview itself consisted of three parts: a verbal test, a mathematical test and an interview. The tests were of a standard GMAT format. The interview itself was conducted with a person on a junior position. The interview with that person was terrible: he was clearly not in a mood to do an interview and told me, that he actually was not supposed to hold the interview and actually has no time for it. My question what he likes about his job was answered first with how stressfull his job is and when I asked again he just said "the money". Also, I have just never heard back from them, no letter of rejection and no answer to my emails.