Yes, you know the interviewer before going to London. As I have already mentioned, beware if it's Lisa Mortini. The questions are usual, as can be found in other topics. Why LBS, why MiM, have you read business news recently, or what was your favorite class during your undergraduate degree.
My problem was that some questions were given in a tricky way and they were not very clear. However, the most difficult part was getting another question regarding the answer. It was really challenging. For example, when she asked me about any article that I have read recently, I started speaking about an article that I have read where the author describes that in the US outstanding student loans discourage banks from lending to graduates; therefore, a recent MBA or a PhD with a salary of lets say $120k and a student loan of $110k can not buy a house. Thus, the RE market suffers from it.
After telling that, the interviewer asked me "and how come that is business news? I see only a problem for students". Then I started explaining, and so on. And after every explanation, I was questioned "So?". Only in the end, when I proved that the RE market is an important factor of the whole economy, she managed to tell me "Good".
All other questions were in a similar manner too